I've been using a trackpad exclusively for 9 years now (since the original Bluetooth Magic Trackpad came out).

For me, touch gestures trump accuracy. I had some Logitech thing with a million buttons all mapped to different actions, and I never managed to get mouse gestures (in Opera at the time) to ever be effective.

Certainly it's a matter of personal choice though, everyone does what works for them. Lots of people swear by only using a keyboard too.