Personally, my favorite depiction probably has to be the winterized combat armor from the Operation Anchorage DLC, which finds a neat balance between the sleekness of the classic Fallout designs and the more realistic modular look found in later games.
Fallout
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The Marine Combat armor from FO4, in the Far Harbour dlc.

Looks the best, IMO, and has the actual best stats across the entire series for Combat Armor. 😃
That armor would be a nightmare to move around in...
Fallout 2 era. Looked thicker, beefier.
I really like the Fallout 3/NV combat armor, with the rounded look and big shoulders.
Especially the Van Graff's customized version, in black.
Fallout 3's design is a nice, realistic look, although the sleeveless arms always looked a bit goofy to me. It will always hold a special place in my heart though, since Fallout 3 was my first.