I don't think you need a Mac to get a decent trackpad. You need one maybe to have a great one.

That is the main difference to me. I hate crappy trackpads but the ones on my 2 thinkpads are good enough for the nomad/mobile use. That doesn't mean I wouldn't prefer the one on a Mac but I wouldn't want to suffer a hostile, OS and lack of repairability just to get a better trackpad.