Yeah, you guys convinced me. The fishing in Colorado sucks because you simply can't do it. Can't touch the stream bed, much less take a pee. I don't know how in the heck I've managed to do it all these years without getting busted.
I haven't fished MT, WY, OR, ID or CA, so I'm not gonna step out there and say one of those are best. I just don't think 'best' can apply if I haven't done it. I'm just not gonna echo something someone else has said.
I'm more of a small stream loner. Don't really have the desire to fish tailwaters or float big water. I don't feel the need to hit water just to say I've been there, and I'm not really looking for lunkers. I don't have the time, at this stage in my life, to travel extensively simply to fish.
I can be in Rocky Mountain National Park in 11 hours. There are dozens of streams and lakes, minimal pressure, spectacular scenery, and all four kinds of trout. There are two subspecies of cutthroats (Greenback and Colorado River) that are indigenous to the Rockies and both rare. They all readily take dry flies. I've seen moose, cougar, elk, bear, big horns and other stuff while fishing there. The pine trees smell really good. I've hopped over the Colorado River at it's upper reaches.
I've fished other areas in CO too. Maybe all this frustration with access is because you guys haven't looked too hard or have focused on the 'name' rivers.
So, I call CO my best because it has exactly what I like, and it's within reach. Maybe in a few years I'll have a new 'best'. I'm not done looking.