What's the best ARM MCU?
I'll just say the 'obvious' answer -- The Freescale Kinetis Family! In their broad range, I am sure you will find a 'good fit' for each performance/cost/integration/function/power-budget/... you might be looking for!
This will help you narrow down which Freescale ARM processor is the best for your particular application: http://cache.freescale.com/files/32bit/doc/brochure/FREESCALEARM.pdf
If you're just getting started with ARM MCU's, one of the low-cost and easy to use Freedom boards will be the best place to start: http://freescale.com/freedom (FRDM-KL46Z being the most feature rich of the Kinetis L families currently)
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