arm c++ compiler chinese
The best price/performance is Rowley but you said price is not an issue.
Size optimization very little difference between IAR and Keil. Speed optimization Keil, based on ARM Realview compiler is faster.
You might want to check your local support for all of the options and make that an important factor!
Where I live, in the SF Bay Area both offer good support. I would think though that IAR support is better in Sweden and Keil support better in Germany just as examples.
Not to forget Rowley, while the company is small, the e-mail support is very good!
Bob