No brand is better than the other. It depends on what you want to do with it and what features are important. Do you need it Windows Mobile based, Palm or Symbian. Is the camera important? Bluetooth? Size?
Here are the best phone review sites. Check them out.

http://www.mobile-phones-uk.org.uk/
http://www.mobileburn.com/
http://www.mobiletechreview.com/
http://www.gsmarena.com/
http://www.mobile-review.com/index-en.shtml

I have a SE P990. Don't touch it.