User blog comment:TheDoctor230/Legends of Tomorrow New Members/@comment-24152851-20171211004602/@comment-1330227-20171212224757

Wally and Roy should be on Titans, but it's not looking super great for that happening. Legends would be a good place for either.

Roy for in-universe reasons since he can't really live a normal life anywhere since everyone thinks he was The Arrow. He could be a good candidate for the Waverider for that reason.

For Wally, it's because the writers on The Flash don't really know how to use him all that well. It worked for a long time to have Barry and Wally together in the comics but on the show they can't really figure out how to use two speedsters together well, except on a couple occasions. Plus, part of the problem with Jax leaving is that they no longer have someone who can work on the Waverider. Wally was introduced as an engineering student in college originally, so he could take over that role from Jax.

Titans would also be a good place for Wally. As for Roy, I don't know how well that would work. With the whole identity problem they caused with him (when they reused the outed identity plot in season 3), I don't know if Titans would be a good fit for this version of him.