Both are great everyday wear/hiking shoes. They won't hold up for longer than a year or two if you're hard on them, but they aren't super expensive and they are comfortable. It comes down to which fit best and feel good walking around the store. I prefer Merrells, I am on my 3rd pair in 6 years wearing them almost everyday to work and school, my job requires hiking so I generally choose the Merrells over my redwing work boots when it's hot and the rattle snake population's low. TG likes his Keens but they are really lightweight (sounds strange that that's a problem, but it can be) and they take some getting used to cause the soles are a little different. I always buy my gear that I'm unsure about from REI. You might be able to find a cheaper price, but REI will take back any gear, any time, even shoes you've walked around in for a month.
