Well, I won't just leave it at that, but explain why I don't.
King Conan Ongoing Series
Good Scot: The King Conan stories offer a clear direction and setting. Conan is King, he has a cast of regular characters (Prospero, Pallantides, the Priest of Mitra, Servius Gallanus), and the possibility for characters to have their roles expanded. Ascalante, Rinaldo, Volmana, Gromel and Dion could have their roles expanded prior to "The Phoenix on the Sword." So could Arpello before "The Scarlet Citadel," and Thespius & Valerius before The Hour of the Dragon. Post Hour of the Dragon, characters like Zenobia, Zelata, Hadrathus and Albiona could be promoted to regulars. Then you have the many possibilities for further adventure hinted by Howard to pull from.
Bad Scot: The previous King Conan stories from Dark Horse - Demons of Khitai, The Midnight God and The Sorrow of Akivasha - don't bode well for a Dark Horse take on King Conan. The persistent Aquiromans of Marvel and now Dark Horse are one of my biggest pet peeves about Conan comics: having an entire series where I couldn't escape from them is an easy pass from me. Then you throw in Uberboreans, Thoth-Amon, Otakhitai, and the like...
Conan One Shot Schedule
Good Scot: Some of the one-shots weren't too bad. The Weight of the Crown had many problems, but at least it tried. There are many stories alluded to in the Conan tales that could make for nice one-shots, and enough gaps in there to take advantage of longer storylines.
Bad Scot: The Sorrow of Akivasha. That is all.
Age of Conan Series (Non-Conan Stories in Hyborian Age)
Good Scot: There are many, many characters of the Hyborian Age that would benefit from a one-shot or even mini-series of their own. Taurus and Shevatas' daring heists and thieving escapades. Astreas and Alcemides exploring the Hyborian continent and its peoples. The legendary plundering of Bloody Tranicos and his fleet, the raids of Strom, Red Ortho and Zaporavo. The adventures of Prospero, Sakumbe, Tuthmes and Valerius across the world. So many possibilities!
Bad Scot: Sure, they could do actual Robert E. Howard characters. But do you know who they would do? Kern, Anok, Nermesa, Alanya and Kral. Or their dull and contradictory interpretations of Kalanthes and Pallantides. Or Janissa.
Valeria Ongoing Series
Good Scot: This has potential. Very little is really known of Valeria's past, and it would be brilliant to have a warrior woman who doesn't have some sort of magical reason for her skills coupled with a moronic rape backstory. Wouldn't it be great for Valeria to be a great swordswoman by virtue of innate skill and practise, without some misogynistic excuse for them? (Why yes, I do happen to have a very low opinion of Janissa, whatever gave you that impression?)
Bad Scot: Of course, that would imply that I have faith in Dark Horse not to muck it up somehow. At worst, they'd make some sort of "traumatic origin story" where she had a bad experience with a lover, or her family was killed, or something like that. There's also the fact that she's an Aquilonian, which raises the spectre of the Aquiromans. I'd be perfectly happy to be proven wrong, though.
Bêlit Ongoing Series
Good Scot: Most of the nations and peoples that would be in a Bêlit series - Shemites, Zingarans, Argosseans, Black Kingdomers - have not thus far been messed up too badly. Stygia has problems resulting from The Book of Thoth, but even they aren't as bad as the Aquiromans or Uberboreans. Plus there's plenty of scope for adventures in time-lost islands and cities. If Dark Horse decides to go with Bêlit, then I'd really like them to distinguish from the Marvel version.
Bad Scot: I have problems with the depiction of Bêlit as a warrior-woman. Roy Thomas did an admirable enough job, but frankly, I find Bêlit more interesting as a schemer, strategist and commander than a warrior-woman. This way, Conan complements her perfectly. Brains and brawn, as it were. By having them both roughly equal in martial prowess, something is lost in the process, and it's a dynamic that separates Conan/Bêlit from Conan/Valeria, as well as from Conan/Zenobia. Making Bêlit (and Zenobia) into real warrior-women dilutes the impact of Valeria, and simplifies their characters at the same time.
Thoth-Amon Ongoing Series
Good Scot: Thoth-Amon is probably one of the most iconic characters in the Conan comics outside of Conan himself, so he'd pull in the interest and the readers. It would offer different narrative styles from Conan, seeing as the main character is an evil sorcerer instead of an amoral barbarian.
Bad Scot: The Book of Thoth, plus any and every appearance of Thoth-Amon in the main comic. I hate Dark Horse's take on Thoth-Amon, and I have no interest in his further adventures. Plus, we already have Dynamite's Fool's Doom: do we really need another Howard villain comic?
Mini- Series Return
Good Scot: Hey, it can't be worse than Songs of the Dead.
Bad Scot: Don't be daft, of course it could be worse than Songs of the Dead!
Young Conan Ongoing Series
Good Scot: It'd be set in Cimmeria. There's a lot of stuff to do in Cimmeria: fighting Vanir & Aesir, beating back Picts, battling rival tribes, uniting against invaders. There's also a lot of Cimmerian mythology to take advantage of, as well as the shadow of Acheron & the Atlanteans.
Bad Scot: Born on the Battlefield and Cimmeria has poisoned the well irrevocably for me. It's possible they could undo some of the damage - make Cimmerian women into actual warriors, get rid of the impoliteness, make Cimmeria into something resembling Howard's creation more - but I doubt they will. Plus, the idea of codifying young Conan's life removes a lot of the mystique of the character. Need I even mention the horrors that could arise from a "Teen Conan" standpoint?
Good Scot: Not sure what this would mean, but if it means different REH tales...
Bad Scot: Not sure what this would mean, but if it means different REH tales...
Nothing - Keep it with Just Conan the Cimmerian
Good Scot: At least this way, they keep all their stuff in one series.
Bad Scot: Agreed.