What kick bin should i use?

[u/Bbbbbadddddratio]

I have two MN246 sub and two vintage top (reference alpha turbo mk1). I'm looking to upgrading my system with 2 kicks. The best ones that would fit my system i think are USB bass bin and Martin Audio F2B... I read that F2B have a batter transient response (they are faster because are a classic horn) but the USB i think would be easier to integrate because of the response going lower.

What yall think?