Latest MAME should work great.
Strictly speaking, I notice there's slightly less slowdown at the rare points where the PCB and ACA both chug (mostly the fourth boss, stage 6-2, and stage 7-1's midboss, in all instances when you're firing POW weapons with both Shadows equipped). But these parts are uncommon, and the speed difference is tiny; the OG slowdown won't compensate for a lack of skill, nor will MAME's slightly faster clip faze a competent player.
Just make sure the game's set to run at its native 55hz speed, not 60hz or higher. MAME should do this automatically, IIRC, but it bears mentioning. 60hz is quite a bit less forgiving WRT timing. It's by no means impossible - I kinda like it, tbh - but it's not ideal for learner players.
Speaking of, ta
Baki season 2.
This how I be visualisin mah RYUICHI DROP (■`w´■)
Slipping and sliding, that ass I be riding!
MASTER THEM TECHS BURINJU (god DAMN! look at the
BUNNYHOP BAKUDAN I drop on 'em from outta NOWHERE in that GIF!
I can hear -
AND FEEL - it just watchin!
)