Shenmue 3. I actually got into it by the end of part 2.
As for Sonic Adventure? um, the best parts of Sonic Adventure have already been tried again in 3d Sonic games that came after it. I don't want to walk around and talk to people with Sonic and I don't care about his stupid friends.
I voted for Shenmue III. Even though I feel the Shenmue games were a little flawed (I still liked them), I'd like to see what kind of improvements can be made over a decade after the release of the second game. Also, I find the story very interesting, not just because of the mystery and suspense, but also because unlike most games that tell a story in between gameplay or that get in the way of gameplay, the story in Shenmue progresses every second you play, which in my opinion is the best way to tell a story in a game.
The reason I voted against Sonic Adventure 3 is because I don't think we need one, at least not in the vein of Sonic Adventure 1&2. There have already been great Sonic games that prove that the Sonic formula can work in other ways, the best example being Sonic Colors. However, if there were a Sonic Adventure 3, I would like the Sonic Adventure concept to evolve more into and RPG.
Shenmue 3, if there going to keep shooting out fantastic sonic games such as.... sonic free riders.... then they might as well stop production of sonic games for a little while then make shenmue 3 and get it over with. sega lost its sonic golden age a long time ago
I've never gotten into Shenmue (I probably lost your viewing on that statement), but Sonic Adventure 3 would be a bit too risky. SEGA would have to get a gameplay system that everyone remembers from SA and SA2, and create new stages, and hopefully NOT have to introduce any new characters into the mix... It's all too much. If you ask me, SA3 is best left to the fans at Sonic Retro, if they even wanna try it.