Honestly, I frequently find cosmetic issues more important than stats. Wherever possible, I'll pick armor based on its looks for instance. Was disappointed in FO:NV when I finally had to move on from the amazing-looking Reinforced Leather to some ugly combat armor, because with the DT system enemies had just gotten too strong for that armor. And I've never used power armor in FO3 or NV, partly because it's not a good look. For instance. (PA is also pretty bad for sneaking, something I like to do. )
Looking at my mod folders for Beth games, the "character appearance" and "armor/clothes" folders take up much more disk space than ones that effect gameplay. FO:NV 2.2gb of mods, 1.9 is bodies/faces/hair/armor. FO3, 5gb of clothes out of 8.5gb of mods. Not that I use all the mods I've downloaded at the same time.....the FO3 folder includes clothes for like 4 different body models that developed over the years.
....really need to go through an clean out some of those folders someday. Even when I'm not playing any Beth games, I still keep an eye on the Nexus "new files" page and grab things that look like they might be interesting. Not sure I've even used every mod I've grabbed. And some of the ones I've tried then went in the "eh, doesn't actually look/run as nice in-game as it seemed in the mod description" but I don't always get around to deleting them....