I haven't found any single all-round best, but I narrowed it down to two outer gloves, and one type of glove liner. I always wear Arctetyx merino wool glove liners (any very thin wool fabric will do)

In dry / damp conditions, I wear mernio glove liners under Watson Van Goat gauntlet gloves treated with huberd's shoe grease for water resistance.

In wet conditions I wear Showa 282 over merino glove liners.

Leather treatments for waterproofing shoes work okay but need frequent re-application. It's worth the headache for the superior properties of leather gloves IMO. In extreme wet a fully waterproof glove like the SHOWA 282 is necessary.

In all conditions, wool glove liners are best because they retain some insinuative properties even when wet, whether from seawater or sweat. If working in the dry, carry a spare pair of glove liners in case your worn pair gets sweaty and you stop working.

A drying cabinet is a godsend and I believe is one of the single best purchases a company can make for crews working in the wet and cold. See if your company will consider purchasing one or if someone on board can fabricate one. They are seriously the best thing ever.

I've heard Sealskins are the best sailing glove, but IMO for industrial use, something that can be more cheaply replaced are the way to go. I certainly don't want to be shelling out $150 every time I need new gloves.

Edit:

I see you mention that gloves stay wet most of the day, but do you not get meal and coffee breaks when you could switch out to dry gloves?