All of them have they're own little quirks that make them pretty good, except Manhattan Express.
Manhattan Express: I really didn't like anything about this coaster. Rough, nothing that exciting about it, really just a coaster that's actually pretty bad. Unless you're a credit whore, stay away from this one. Really isn't worth the money.
High Roller: A pretty bland design, but the fact that it's 1000(?) feet in the air makes it a really great thrill. Simply because of the height of the Stratosphere Tower I would try and ride most of the rides up there.
Canyon Blaster: Actually a decent coaster. It was pretty smooth when I was there, and I thought that it was decent, since it is built indoors, which limits the space. Get at least one ride on this one.
Speed: My personal favorite of the Vegas coasters. I loved the launch out of the tunnel, and the loop. The return part of the ride is a little bland though. Probably the best of the bunch (my opinion).
I was in Vegas last October and I was only able to ride Manhattan Express. I agree completely with the overall opinion here. This ride is way too rough. Bangs the heck out of you. Definitely not recommended, especially when you have to pay around $15 for a ride. Speed wasn't running when I was there.
What I really like about that (more than the fake wooden coaster) is that there is a real Eli Ferris wheel there, not some fake imitation. Nevermind the fact that it doesn't operate, at least it's real...
Has it been changed at some point during the last 7 years? That's when I saw it (even stayed there as I needed a cheap place to stay when I passing through), and I remember the coaster looking much different than it does in a picture I just saw and ferris wheel looked fake.
Does anyone know why there isn't or has ever been a wooden coaster in Vegas? Is it too high a maintenance nightmare? Some have said it's the heat factor, but I don't buy that since they could build it indoors. The theming could be spectacular though.
Now this has me thinking that there could be a steel coaster, similar to Thunder Dolphin in Japan, blended in a themed resort area. Imagine a coaster integrated within the architecture threading through tall buildings, diving into waterfall like abyss', spiraling down a statue, etc, etc. There's so much they could do.
Why is it, that in a city that makes so much money maintaining a coaster is almost nonexistent or too difficult? I read and hear a lot about coasters constantly being down in Vegas, and I wonder why that happens so much? And the charge to ride continually rises fiercely. So, it can't be maintenance costs.
Now I think I see why they don't have a wooden coaster. Maybe it's a blessing to say, 'what happens in Vegas stays in Vegas'.