I favor the green (menthol eucalyptus). Proraso isn't the slickest, most protective soap made, but it still works fine, and for some reason I keep it in my rotation. The price is surely right.
I'll take the green. It has a classic scent that is singular, provides a solid slick shave every time and just has an amazing old school feel. My distant second would be the blue.
To date the white is the only cream of any type I have tried, it worked pretty well but I think I'll stick with soaps and croaps in the future. As has been mentioned by others in this thread, I would prefer there was no menthol at all even though it's subtle. Based on that I can tell the Green would be a hard no for me. I suspect I'd probably like the Red best of all as I like the Red soap so if I do buy another cream down the road chances are that is what it'll be.
I'm still a n00b and Red (pre-/creme/after) was my first wet shaving set-up. I really like it - no complaints.
...but I got the Green set last week. I was expecting them to provide pretty much the same experience, other than the smell, but wow has it been different. It seems smoother, easier and more comfortable to me, but I don't know if it's just the scent and cooling effect that's playing with my mind or what.