Better is a subjective word in this case. It really depends on the person, do you want a small yet decent amount of padding? or do you want very little for better training purposes. Your choice.
once broken in i find the ultimate 81's to be the perfect amount of padding. the mexico 66's tend to become like a slipper while the 81's tend to stay like a sneaker but, very flexible. you can still really feel the ground, there is just a bit more support.
in my really honest opinion these are the shoes i have been looking for. i have been searching for a shoe that is very parkour friendly and i truly believe these particular 81's are it. i may see if i can get some more support and get in touch with asics and talk about a parkour shoe of sorts.
i would love to see them put out an onitsuka style parkour shoe. all of their shoes are pretty high performance with good materials.