I've read multiple comparisons of the Nexus One and Incredible and pretty much all of them confirmed the N1 was faster. So it isn't much of a stretch to think the same applies to the Evo, especially considering they are the same processor.
It's also not that much of a stretch for someone to piece it together themselves. One of them is running Froyo, and has absolutely nothing on top of the stock OS. One is still running 2.1 and has a whole interface on top of the OS. Even if they were both running 2.1 the first one still applies.
True, but I still think it's best to try both on your hands. Some reviewers are very picky and they notice tiniest difference and make a big case out of it.
By the way, both Incredible and EVO have a bit more RAM than N1. So it counteracts with the added Sense UI layer.