My commuter came with two-sided clipless Shimano SPDs, but one side had a plastic platform clipped into it, so you could wear regular shoes. While I was initially skeptical, they've been pretty good for casual rides to the store and around the neighborhood. They've also allowed me to use my bike to go from one building to another during the workday without worrying about wearing business shoes. This works better for me than toe cages, for example, as I wear dressy shoes and they'd be scuffed by the cages.
I wear SPD-equipped MTB shoes when riding the main commute, but it's nice to have the flexibility to wear regular shoes.
It all comes down to the type of riding you're going to be doing and what type of clothing/attire you need to be wearing at both ends.