Mikey Garcia Says His Fight With Errol Spence Will Top Manny vs. Floyd

[[tmz:video id="0_13y1apx8"]] Mikey Garcia's HUGE upcoming fight with Errol Spence will be way better than Manny Pacquiao and Floyd Mayweather's 2015 fight ... and Garcia is telling us why. Little background first ... Manny and Floyd had…