It depends entirely on your standards and expectations.
If you want the gloss and longevity of the original gelcoat and will do
a lot of work om the preparation, then two-part poluyrethane paint
(interthane, awlgrip) systems are the choice.
If gloss doesn't matter and you'll tolerate more rapid weatrhering and
lower scuff toughness, then the various urethane-modified alkyd
paints(Brightside, Toplac) will do.
If you want it to have a discenable color and weather well, acrylic
latex housepaint will do.

Epoxy paints are tough paints for garage floors. They don't weather
well. Easypoxy is not an epoxy.

Robert or Karen Swarts wrote:

Do any of you have suggestions or opinions regarding the best type of paint
(urethane, epoxy, gel coat, etc) to refinish the topsides of a gel coated
hull?

Thanks,
Bob Swarts