I've got eggbeaters on my mountain bike and speedplays (the cheapest ones) on my road bike.

I really like both of them, but they're the only thing I've ever ridden with, so I can't compare.

I will take my mountain bike on rides where I know I'm going to want to walk because of the recessed cleat. It's one reason I rode my mountain bike on the Rosarito-Ensenada ride this year, so I could walk around after. (Besides, I was going with my husband who rides a lot less than I do, so I was doing a relatively slow ride anyway.)