They all have to do with personal feeling IMHO. I have a Razer Lachesis which cost me $80 AU here in Australia 9 Years ago and it's still going strong. It's narrow and long which suits my narrow long hands and fingers and it's light. I've heard plenty of people say Razers build quality is poor, but as I've said earlier mine has lasted 9 years cause I like it and take care of it, also it's no longer made so I can't get another lol.
Find something that you like the look of, has a decent reputation and fits your hand well and you'll do fine.