Two opposite factors
uptempo means more possessions which means that the final results are more likely to reflect the real balance of the ability of the two teams
BUT
uptempo means that the 7th, 8th, 9th, 10th guys will get more minutes - if your 7th-10th guys are better than his you might want to do this
On the other hand if the depth edge for you is small and his starters are a ton better, you might want to go slow, try some weird stuff and hope it works