Forgot to add; you mentioned release options. Shimano SPD has 2 types of cleats;
single release(heel out) and multi release(heel in, heel up and heel out). Never
really tried the other methods to release; heel in or up. Seems like you're likely to
hit something on the bike if you twist in and twisting up seems unnatural. Maybe
they're options for riders with some type of physical issue or for emergencies.

I use Xpedo titanium clipless pedals on my folder; the cleats are SPD compatible:
https://www.youtube.com/watch?v=Fh5V...IoDLA&index=10