Hello to everyone

I'm in the market to for a new toy sort of speak and I've always. The M5 is going for about the same price as a m3. I was wondering which one you would buy not counting looks, just base on performance. I've been searching all over the place for some sort of comparsion which I haven't been able to find. It be great if you can provide some details to your rationale for your choice

thank you

Tim