It's a personal thing, but tbh I've found that Dodo Juice Supernatural is right up there with the best. It certainly adds gloss, but more importantly it's also very easy to work with. Some waxes can be a PITA in some conditions, but I've always found DJSN to work brilliantly in all temps.
However, wax is just a protector. To get a proper deep shine you'll need polish, and that's a whole different ball game...