Hi there, I just came across your question and thought you're having a situation similar to my current one. I'm trying to build a simple wearable using an ARM MCU and thought so far results I'll try to answer. Personally I used the STM32F4 discovery board , it's a real powerful Cortex-M4 dev board.
There is plenty of support out there for the board and useful resources + it has lots of features on and not really that expensive. On the other hand i don't think that it is that easy to convert it into a real circuit now that I'm done with the prototype and for a beginner like me , build a circuit for an ARM at first pitch sounds quiet challenging.
I think the cypress here wins if you can jump in and convert it into a ready product with no fuss.
Now looking at it i might get one for myself.
Good luck !