For 6wt and lower I prefer reverse half wells/western. Yes, they're the same. Some will say that a western is different because it might be thicker at the front than a reverse half wells, but they are effectively the same.
I like full wells for 7wt and bigger, but it seems many of the newer rods are making a very thin full wells. I have big hands so a thicker full wells is much better for me. It keeps the cramps and tendonitis at bay.
I really like the 7" grips I've ordered from Proof Fly Fishing.
My old IMX 5wt needed rebuilt since I broke the butt. Long story, but I had a spare butt section from G Loomis sending me a complete replacement blank when I had a gen 1 tip issue.
I used Proof's rubber cork faced reverse half wells 7" (inlet .790) along with the original reel seat and really like it. It's a bit thicker than the one I put on my original gen 1 (1987 or 88). I think it's nicer cork as well. Only $22, which seems pretty reasonable given the supposed cork shortage.
I think it looks nice, but more important than that, it feels nice.
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I also ordered the Proof rubber cork faced full wells 7" (inlet .850") to replace the crappy cork on my gen 1 Fenwick Aetos 8wt. I really like it. The Aetos has a very light swing weight so can get away with a small grip, but again, I have mitts so this has been a game changer. And it's really nice cork for the $22.
Here it is on the left, next to my other 8wt. The Fly Project's Project One. The grip on the Project One grip is a bit more slim, like most of the big-name rods these days. My 11wt Orvis Clearwater musky specific rod is even thinner. I don't quite get it, even knowing my bias of big hands. Is it so you can "feel" more?? Or is it so they buy cheaper cork? Or maybe there are just more fly fishers with small ass hands these days.
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And the 11wt Sage RPLX that my buddy built for me also has a 7" fulls wells grip from Proof. No rubber facing on that one, but same thickness which is really nice for that friggin tuna stick.
Anyway, I have 3 of them and highly recommend. And I'm not going to carbon fiber no matter how many benefits it has. It's just wrong.