In terms of "Practicality" then the DS9/GEN/VOY uniforms would be the best, since they are lightweight, unrestrictive, temperature reactive and likely to be made with a strong material
However in terms of "Functionality" the TWOK uniforms serve that purpose better, in particular the "Away Mission Jackets", each of these jackets have several modules for Weapons, Communicators, Tricorders, Survival Supplies and spacious pockets, they are heavy and bulky and perhaps restrictive, however in harsh climate, they are ideal since they are likely made with a thermal material