It's hard to rank them as I do like them as a band. But if I had to i'd be something like this:
1. Tomomi - The thing with Timo is that I'm a sucker for her persona. Hyper, crazy, very funny and just enjoys herself anywhere she goes. It rubbs off on you. To make things better she is crazy cute and talanted.
2. Rina - It's actually after reading her blogposts here on SH that I started liking her alot more. She seems deep and wise despite her age. She is also funny and has this classic beauty.
3. Haruna - She is very sexy and just radiates "rock" mentality. Seems to be a strong person and that makes it a good thing that she is sorta the "front" person of the band. Other than that I don't know much about her yet.
4. Mami - The reason Mami ends up last, despite of course I love all of the members alot, is because she often takes the backseat in the stuff I've seen her in. I know she is a otaku, but thats about it.
I have my computer full of SCANDAL behind the scenes stuff and interviews but I have only had time to finish a handfull yet so the positions might change except my favorite member. But they are all really close in my affection and together they make up my favorite band. Actually my first favorite girl band ever even.