Well, I don't like the look of a Stainless Countertop at all, and it is expensive and difficult to install. Very functional and industrial, but this is a boat for living on , not a restaurant. I gave consideration to Corian, and would really like that, but I am self installing it, and not sure about cutting out the lids, installing hinges etc. That really needs to be perfect to look good. Also, Corian is thicker, and I am afraid it will lock in the cabinets, which will need to be removed in a few years to replace hoses etc. Also, it's pricier.
So, Formica is the compromise. The original is Formica, and in bad shape after 40+ years. But I think new Formica will be fine and last well. It's easy enough to self install and do a good job, inexpensive, and I can have my galley back together in a reasonable timeframe.
Also looking at sinks. I might try to reuse the sink that is there, but need to inspect and test it. It might have a pinhole leak-not visible except for a drop of water that appears on the underside. But maybe it is condensation or dripping from somewhere else. I will need to inspect and test it outside of the boat. Requirements for a sink. It absolutely MUST be 2 basin, and the MUST be 10" deep, not the 6 or 8 inches almost all of them seem to be now. I have found only one that fits and meets that requirement, and it is $800. So saving the original sink is prefered.