Ridley_Prime
Smug icon slayer
^ I don't know as far as best teams, nor have I paid too much attention to the tier stuff, playing this game on and off, but based on just like basic observations,
ToP Android 17 looks decent for someone to play more defensively (tho I don't have him), Cooler has a good punish game... Merged Zamasu I wish I could recommend just as well, who I heard was like low tier, but he's fun at least imo.
And DBS Broly is fresh for a tank kind of fighter. GT kid Goku I guess is the Bardock of season 2 if you want to tier whore, but I didn't get him myself. Looks too versatile for his own good compared to most of the other cast.
Again though, I don't really know the best team setups, regardless of tiers. Wish I could be of more help there.
Also posting because I realized I forgot to post this earlier.
YouTube video
I might actually have to buy season 3 at some point, depending on what the rest of the characters consist of. So far though it's had some of my most wanted added. Kefla, UI Goku, and now Roshi...
Mind you, I didn't feel this way with season 1 and 2, who I only got a few characters for individually.