I've been using Clousers for the past 6-7 years for smallmouth. They work
for me, but a I tie them with bead chain eyes (no lead dumbells are going
to break my rods
). I've been within casting distance of other FF going
after smallmouth, and my Clousers work when their ____ patterns don't. I tend to stick with a pattern until it doesn't work, and the haven't had a reason to switch.
Having said that, I'd use any bucktail and flash streamer for smallmouth.
Presentation plays a big role as well. I cast up and across, but get a large
portion of my strikes while stripping the fly back upstream. It's easy to pull
a streamer out of the fish's mouth in that circumstance, so sharp hooks and
a one second pause helps.