>>531483003
As long as you have 1 action advancer (Sunday, Bronya, RMC) you should be fine. The other support depends on the match-ups (Tribbie for AoE, Robin /Cipher for fewer targets, RM for AS).
The Bronya E2 speed buff is just preferable as it lets you get away with atk boots which makes her competitive with Sunday as he offers no atk buffs but E1 already solves some SP issues.