Travis has provided a good run-down on the different braking systems on baitcasting reels. I actually prefer a "less is more" approach - my favorite baitcasting reels are the classic Abu Garcia Ambassadeur 5000 and 6000 series. They have fewer magnets and braking systems, but they are simple to operate and I can get a longer cast out of them. Take my input for what it's worth, though. There was a time when I bass fished and striper fished with baitcasters a LOT, but now I stick with a flyrod 99 percent of the time.
Having said all that, baitcasters are really not ideal for most trout fishing anyway, even with jerkbaits. A good spinning reel with a high-quality drag will probably perform better for you and be more versatile. You can use the same rod and reel for big brown trout and trophy smallmouth fishing, because the demands are about the same.
If you're after largemouth, stripers, and catfish, a baitcaster has its place. But for trout and smallies I'd prefer a spinning rod.
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