Everyone has their own favourites as far as Starfleet uniform goes, however while most if not all of them make for decent ship-board uniforms (generally of the 'service uniform' type, but the ESF 'jumpsuits', the 'VOY' jumpsuits and even the 'FC' uniforms make for half-decent 'working uniforms' (tho TOS and TNG also had the 'overalls' for that as well).
However, with the possible exception of ENT, I personally think that we rarely if ever saw a decent 'field uniform' (and even then I prefer the 'desert khakis' over the ship-side 'blues' and jacket combo). I think VOY also experimented with a couple variations (including but not limited to "Blood Oath" and "Friendship One") but I think even those were flawed not so much in the uniforms themselves (which were IMO better than the standard ones) but more what was missing. Body armor is a difficult topic (anti-phaser personal armor is likely impossible) but there are many reasons why helmets, equipment vest or rucksacks should be a standard part of an away team's equipment (first aid kit, food and water, portable computer/subspace radio (I refuse to believe that that filing cabinet-sized unit from "The Ascent" is the best they can do), space blankets etc) given that experience has shown that away teams can't always rely on the transporter to be able (or even available) to pluck them out of danger.
NB: Episodes where officers are going 'undercover' (esp on primitive pre-Contact worlds) have their own issues and to and extent get a pass on this (though to my mind, a proper 'base camp' should ideally be established planet-side in this case with as close as possible to the proper equipment).
Shamrock Holmes