The real question is why are you picking just one or the other? If it's for 3v3, I'd go with Boba. The most general purpose BH squad is usually Bossk/Dengar/Boba/Embo/Jango. The first 3 are pretty much required. Bossk obviously as the meat shield, and Dengar is key from a mechanics perspective ( his aoe gives ten down, detonators, anti-stealth, 50% enemy squad-wise TM reduction, and 50% or more health/prot regen under zBossk ). Boba will give you a very quick AB block and debuffs to cripple the enemy quickly, and those debuffs also boost Jango's damage on his basic ( which is important when Dengar starts calling in assists on debuffed enemies or while he's stealthed)
The last two slots are kind of plug and play, but once payouts pop, Embo and jango really take off more than the others. Dispel on basic from Embo, and anti-revive from Jango are very very useful in PvP.
Jango and Boba have a lot of synergy together, no matter if you use Bossk or jango lead ( or any other for that matter).
