Three Spinners to Use to Catch Trout
There are three spinners I've found effective in catching trout. Or really three types of spinners: narrow-bladed, regular-bladed and shaft-in-blade spinners. I'll admit it - I made those names up but that's pretty much the best way to differentiate these. The blade is what affects the movement and vibration of the spinner, so that is the biggest thing that can change how a trout sees your lure.
Narrow-bladed spinners have well, a narrow blade. The Mepps Aglia Long series and Rooster Tail spinners are two examples. The narrow blade means that the spinner doesn't dive very deep and it doesn't create as much vibration as other spinners with larger blades. These are effective for trout in shallow water or especially wary fish.
Regular-bladed spinners have a larger blade and are typified by the Mepps Aglia or Blue Fox spinners. These are what you might call the "original" fishing spinner. These are effective in most situations and are a good "baseline" spinner to start with before making adjustments like adding a sinker or switching to another spinner type.
Shaft-in-blade spinners have a hole in the blade that the shaft goes through. They tend to dive deeper and create a little more action than the other two types we're talking about here. I've had a lot of luck with these types of lures. The extra action seems to really rile the fish up and the extra depth gets the lure closer to the trout hiding in deeper holes. Panther Martin is the classic example of the shaft-in blade spinner.
That covers the three types of trout spinners. Experiment with them and find what works for you. I've found the shaft-in-blade and regular-bladed spinners are especially effective, but have had little luck with narrow-bladed spinners. But the narrow-bladed spinners continue to be popular, so you might find them effective.