I'm leaning heavily towards the Prada. I do like the Betty a lot as well. I need to walk around the store in them a bit to see. It's just hard because the real test is how your feet feel an hour or two later, not how they feel after prancing around for a couple of minutes.
I've bought so much other random stuff this past week I'll probably wait until next week or the week after to make my final decision (curse you NordstromAnniversary sale and random summer parties!!! ).