Even if Wally and Kyle are my favorite to hold those mantles, I think Hal and Barry worked better as a team and as friends who understand each other... even if one died a hero and the other died a criminal.

Alan and Jay along with Barry and John.

Wally and Kyle may have both been Titans, but my bias for members of that team doesn’t influence my decision here, ha. I enjoy Jay and Alan’s friendship the most. They work so well together and hang out outside of heroics so, so often. It’s heartwarming.

I liked Wally and Hal's team-up in the early issues of Mark Waid's run.

Jay/Alan followed by Wally/Kyle.