All the pedals you mentioned are outstanding.I have used all of them ( well the time rxs almost the same.)All have the good points shimano's have a wide platform very strong cleats, last forever.Time are much lighter and have lot of float.Look are light platform is not as wide unless you get the blade.
I could use any of them and be really happy,at the present I am useing the look keo max.I am fickle and might change my mind in a few months