I fish all winter, and have tried everything.

Fingerless gloves make my fingers feel even colder.

Most gloves interfere with my ability to cast light spinning gear.

Specialized fishing gloves made for steelheading work great -- until they leak. Stripers have a lot of sharp corners and points on them. Handle a lot of them, and any gloves relying on a thin membrane for their waterproof attribute will get poked through sooner or later. Then they are horrible. And they are expensive.

I put on the heaviest gloves I own when running the boat.

When actually fishing, I go with cheap cotton glove liners, and hand warmers in place. I carry about a dozen pairs of glove liners and change when wet.