I had the same issue when I ordered mine back in April. Took me an age to decide.
Everyone I spoke with at the DZ said go small. Every time I asked why they just said it looks better and everyone has them.
After reading for hours online and on dropzone I went with the large rings.. I couldn't find one decent supporting argument for using mini's over the large other than looks.
I figured If its just looks and the larger rings have an increased mechanical advantage why not give myself the best chances I have up there if I can. :) Plus im not a small dude but by no means the biggest.
Im happy with the choice however almost every weekend I get someone asking me why I have large rings and why I didn't get mini..Some people give me weird looks when I say I wanted them large...Even the odd experienced instructor.
Screw looking good for others, I think they are cool :D, Plus im already jumping out of a plane and thats cool enough for me