I've used a lot of different waxes over the years, but the last couple years I've been using a Meguiar's spray wax.
Definitely use a clay bar first on paint that still has its shine.
Faded/oxidized/stained will need compounding first.
The spray wax lasts months outside, easy to apply.
The ceramic sounds longer-lasting but I haven't tried it yet.
Here's a winter pic of my trusty '93 Pathfinder, mostly original paint, 209,000 miles.