I love my Keens. This year will be my 3rd year wearing them & they still look great. I go for walks in them too & my feet never hurt (maybe that is me). Plus they go thru the wash every few days, unlike my kids Keens go thru the wash after each day.
I haven't tried Merrells other then winter shoes but I am sure they are comfy & my sister has a pair or Taos that she loves.
FYI, I just bought Merrells on Shoebuy when all shoes were 20% off. I signed up as a member & got another $8 ish off. So retail & on Shoebuy they were $90 & I paid $65. I am so glad I sprained my ankle & had a swollen foot for a month otherwise I would of ended up paying full price for them.