It's like trying to compare chunking for tuna to trolling and or jigging them. Each technique has a time and place. But for anyone who hasn't experienced it, being on the water with trout rising on a hatch and figuring out the pattern, well let's just say you have to experience it to realize how satisfying and rewarding it is watching a trout rise on your fly especially if you tie your own. Or even fishing sub surface wet flies, nymphs or streamers. Indescribable!
I also agree with Capt. Lou in general although there's a lot of very large savvy trout that fall to flies fished properly, in the right conditions and especially when it comes to large browns at night. Just check out legendary Joe Humphrey's Pa. 34" state record brown trout on a fly and story in the attached link. Picture is about three quarters of the way down the article.
Lot of monster browns in the Delaware that wash in from stocked tributaries in NJ and Pa. Big water, big profile flies and late night fishing and don't be surprised hooking one of the giants in that system. Big browns will lie in the cooler deep water holes during the day and feed almost exclusively at night.
http://www.52weekseason.com/home/201.../joe-humphreys
