Canot comment on leather as an owner just as a passenger, and I didnt like it.
Altohugh it was well maintained, in mint condition.
Looks very elegant, but not so comfy, feels strange and cold on the skin in my opinion, and needs a lot more attention to maintain it's nice look!!
As for textile and suede, had 2 Civics, facelifted with simple textile, and now the pre-facelift with suede seats.
Pros and cons ->
Simple textile
+ easier to clean, less prone to get dirty
+ good "all-arounder" in summer and winter too
- cheaper, simpler look
Suede
+ nicer feel on the skin upon contact with the suede
+ lloks more elegant than simple textile
- slightly more difficult to clean, more prone to show it's age/wear (due to rubbing it's surface, not proper cleaning, etc.)
- in hot weather conditions, it feels warmer on your back if not using AC