I'm posting links to another forums (hope that's OK), but with some very good photos - both comparison and different views for the following grips:
Navidrex
Spegel
Hogue
Mil Tac
Herrett
By far Navidrex grips seems to be the slimmest and Herretts the thickest. Hope this will help.
http://www.handgunsandammunition.com/holsters-gun-accessories/12063-vz-pro-slims-hi-power.html Different views, just scroll down to post #3 for links to other grip models.
https://forums.1911forum.com/showthread.php?t=379405 Comparison photos.
I'm not quite sure about that - If one goes just for the looks then yes, you change grips quite often. Especially if it's just a range gun. The change is not because of the fit I think, but just excitement and desire to try something "new" and "different". For the last 10 years I use only Pachmayrs - sure, I have tried different grips in the past, but those rubber monstrosities fit my hand so well that I don't see a reason to change them. But it's my daily carry gun, so form follows function in this case. From time to time, thanks to treads like this, I get an itch to try some new and fancy grips, but then I say to myself: "You satisfied with those ugly rubber thingies? Well, yes I am! Then why bother?!? Just buy more ammo instead!".
Best,
Boris