I really like old-fashioned, made from beetle carapaces, spar varnish. The urethane varnishes are too soft and plastic-y for my taste. Can be applied with a good brush and then tipped off with a dry brush. Builds to a nice appearance of depth easily. 220 hand sand lightly between coats, tack wipe and you're good to go. Can be applied outdoors, but that risks dust and bugs. Indoors in a dust free environment is fine.
Once you get the feel for it, hand application is fun. You can refresh the finish in a few years, no problem.
Epifanes is a great brand. Top quality marine spar varnish has a lot of UV inhibitors in it, more than adequate for indoor use.