I just took the poll and currently it's 50/50 for Fresh and Kiehl's!
I like both lines, but my favorite is Fresh. I have used their Soy Face Cleanser for the longest time because it's one of the only products I have ever found that I can literally get inside my eyes and it won't sting. Some say they love the scent (what does soy smell like, actually?), but for me the scent and the cost are the two drawbacks. It just leaves my skin soft and clean so I'll continue to buy it. Also works great on the delicate Clarisonic brush head!
The other Fresh product that I will have for life is the Strawberry Sugar Face Scrub (I think that's what it is called). From my days as an esthetician loooong ago in FLorida, using fruit based products is a great way to exfoliate naturally due to the acids in the fruit - not as harsh as a BHA or AHA. I love that it's little strawberry seeds on your face.
Again, it's really expensive so I use sparingly.
To be fair, I haven't used a ton of the Kiehls products, so I suppose I'm biased. I just stick to what I know as my skin tends to be fussy and once I find something that works I don't test the waters.