Bee wins. You didn't restrict Bijuu Mode either which is something Ay can't handle. V2 Bee would overpower Ay's Lariat and Ay can't really damage Bee to begin with. If worst comes to worst, Bee outlasts him.
Base Bee is - already faster than KCM Naruto and Ei. The second version of his transformation whom was dodged effortlessly by MS Sasuke is faster than V2 Ei. MS Sasuke > Base Bee > V2 Ei in speed, which means Bee blitzes him low difference.