I think it's pretty clear that Heroes for Hire is a big fan favorite. For good reason, it's got strong characters that aren't quite big enough for the trilogy treatment, but they are affordable on a premium cable TV budget, throw in whatever's unused from the Jessica Jones TV show as supporting cast and ride that train for 16 episodes. A bit of a cop drama, but with the freelance flavor, like so many other shows before it. Very Robin Hood-ish in terms of the feel and theme of the team. Like Leverage or... Firefly. Just trying to pay bills, but really they're deep down about something much bigger.
Agent Carter has been in the rumor mill a bit, so that's been planned the longest. A period Agents of SHIELD didn't seem like a good idea to me at first, but on cable/VOD with a set 12 episodes to flesh out the background of SHIELD and the MCU at large. That almost has to happen, and Peggy Carter is the girl to put that on her shoulders.
Daredevil or Punisher are no-brainers. One of them should happen, but because of their similarity as street level heroes dealing with Marvel's mobsters, I wouldn't suggest both, even though as individuals, their characters are different, the MCU crime thriller story is pretty much the same. I would favor Daredevil, because honestly the Punishers we've seen so far have been pretty good already, and Daredevil offers that courtroom drama angle which could be quite awesome. Plus, Daredevil's got a better supporting cast and rogue's gallery in terms of Karen Page, Foggy Nelson, Elektra, Bullseye and yes, the Kingpin. 13 Episodes should bring this home in a powerful way.
I would strongly consider binding all these series together with the Kingpin as a cameo.
Black Widow with or without Hawkeye could also make for a very compelling miniseries. With 6 episodes, it'd be a lot like having her own couple of films in one setting, especially if the quality backed that up, which it very well could. A Hulk miniseries would be just as great, but I think it'd be far too Banner-centric, even on a premium TV budget. Also, Planet Hulk as a six episode mini-series might be very interesting if Marvel reconsidered that in this format.
That leaves 13 episodes? Cool. Honestly, it could go several ways. Using Hulk as a cameo you could do a She-Hulk thing, complete with courtroom drama like Daredevil if you end up doing punisher. You could bump Black Widow up to a full series, depending on the commitments and run Hawkeye as a separate miniseries. Power Pack, Runaways, and New Warriors all could do well with a TV incarnation. Speaking of Runaways, you could use this opportunity to do the stories that don't make the cut for Phase 3, like Captain Marvel, Black Panther or Inhumans.
But I think that last one might be my favorite, and the most likely to get a second season, so to speak. Inhumans, as a 13 episode sort of super powered Game of Thrones/X-Men fusion could be, in a word, awesome. It could also guest and explain the powers of Quicksilver and Scarlet Witch, and create a really strong really diverse cast of memorable, dynamic characters that fill out a whole world that can rn parallel within the MCU without necessarily feeling like it needs to be part of the Avengers. People will want Luke Cage, Iron Fist, even Daredevil on the Avengers, like in the comics, which can cause an issue if the level of actor you can afford for VOD isn't the level of actor you want in a summer blockbuster... but no one is going to ask for Blackbolt to be on the Avengers, they understand instantly.
So yeah, mine is:
Heroes for Hire, 16 epis - cop drama with Iron Fist/Power Man buddy system
Agent Carter, 12 eps - origin story for the MCU
Daredevil, 13 eps - courtroom drama, street level heroics
Inhumans, 13 eps - Game of Thrones/X-Men fusion drama
Black Widow, 6 eps - Black Widow spy thriller
