Well, it's one of those great debates. The tough part is, especially with wild trout, you only get one cast at them, so it makes it hard to "experiment" since the variables immediately change and the stream immediately changes from one place to another. When I fish with my buddies, we always make sure we have different colors/patterns on and we alternate who fishes in front on the smaller waters, and I'm not sure I ever notice a difference at all between catch rates. Sure some days, one color/pattern or person does better, but is it because it is better or because that is the one we fished over better water. Sometimes I feel the stocked trout are harder to catch...sometimes they are so easy it's not fun (ok, that was too much, of course it is fun!)
I fished the Gunpowder last summer...with extremely low flows and a lot of other anglers. I fished upstream with the standard gold/white colorado blade and landed 35 wild browns/bows. Some places I caught fish on consecutive casts (5 in a row on one stretch). When I reached the top part of fishing, I had two options...fish back to the car over water I already covered, or hike the trail back. I decided to mix it up and fish my "colorful" spinners back. I landed another 14 or so trout doing that. Would they have that the first time through or did I make better casts? Others I talked to were extremely happy with the fishing if they caught 8 trout, I had almost 50. We fly fished it the day before and landed 42 between the two of us, so maybe we are just better anglers ;-) (please note lots of sarcasm there....probably just luckier, but we fished HARD!)
I think that presentation is key, and you will make better presentations with a spinner you like and feel more confident about. That's why I make some of these styles, they look cool, guys like that so I think they subconsciously fish them better. I had gotten some bright orange blades in with a bunch of bulk blades once, made a few up and a guy wanted them all because orange was his favorite color and he absolutely slammed wild brookies with it... go figure.