What kind of trip to Antarctica? Those trips span the zone from cruise ships zipping by, to trips with lots of hiking in the Falklands, South Georgia, and Antarctica proper.
As far as I know, outfits that will do a bunch of stuff on shore (Lindblad, Quark, Hurtigruten, etc.) generally provide appropriate jackets (not the very best, but quite adequate). They also each have a preferred color (i.e. Lindblad is usually red, Quark yellow, etc.) and they like their customers in that color when they are looking around to see where said customers are.
IMO, except for the cruise ship thing, an urban style or athletic cut jacket is suboptimal. You definitely want something that'll take layers underneath. Layers ranging from a light sweater to some fleece + a down sweater/jacket. And with a hood. For my two cents - any good 3-ply is ideal. But 2-ply or a lightly insulated jacket with a good quality waterproof/breathable outer layer is a fine enough choice. You can probably expect anything from spring-like weather to blizzard (or katabatic winds). Sometimes transitioning in mere moments.
I like Norrona. Arcteryx is great. Etc. Really any good quality brand will have you covered. However, remember salt water is incredibly hard on Goretex (and similar). And when zipping around in a zodiac,or messing about in an inflatable kayak, etc, some splashing is likely. So that could be an argument for going less than uber-super-duper-delux.... Especially for the rain pants part of your outfit.
Also, if you are going to be going on shore a bunch - Muck Boots Arctic edition will be your friend. I was skeptical. No more.
Bottom line after all that - if your operator provides a decent jacket, I'd go with that....