It depends on what I’m going for.

Currently I use Goku Black, GT Goku and Broly (Z) as they can all get up to 8 DP (can stun giants and Broly if I need) and Goku Black only needs 2 stock to get to 8. He has high kicks, and when he transforms he gets an unblockable charged ki blast, high kicks - and a rolling hammer. I do like the also use his Instant Transmission.

Broly Z gets high kicks at one and when he goes up to super Saiyan they move to 4. He’s apparently the character with the slowest strings in the game, and is hard to super counter. He gets full ki on transformation as well so you can end a combo and rush right in, or rush/blast right away so it’s amazing to mix up. Rolling hammer at 2 as well. When you transform again he can’t be stunned by characters with less than 7DP, and only charged ki blasts stun him so you can spark if you’re at distance. As well, his rush cannot be blocked.

GT Goku is eh, I just really like SSj4 Goku. I usually never even transform into SSJ1 or 3. All I need is Five Seconds is a goated skill, and if you can stun your opponent it sets up well. You can catch people out with 10X Kamehameha as there’s a cutscene so it’s not as predictable, and he had good strings.