When I was a student in Pensacola, I had an opportunity to see one of their periodic "head to head" semi-private shows. I think they do it annually or every other year and alternate between doing it at Nellis and Pensacola. Anyway, like most have said they both put on good shows. For my $.02, I found the T-birds' show to be a little more graceful and the Blues' show was a little more agressive. And yes, having been trained in a "joint" environment, having served with USAF officers, and worked with USAF assets in both operational and exercise settings, it DOES to a certain degree reflect the different types of flying each service does. That's not a value statement at all - just the way it is. Both branches are good at what they do. It's just that flying around an Air Force Base and flying around the boat are rather distinct experiences!!! :)
Over the years, I've also had the chance to work with RAF officers and, with what exposure to the RAF that's given me plus the fact I'm a fan of "The Few" anyway, I'm very eager to see the Red Arrows someday. I also went through flight school with some Italians and their pride in their service has me interested in seeing "Frecce Tricolore" (sp?) as well.
And finally, I'll agree that for the sheer impressiveness of seeing a whole LOT of airplanes moving around as one, it's tough to beat the Snowbirds. They have a formation of what, NINE planes? something crazy like that :) Wacky Canucks ;)