It's difficult to blindly compare two tire brands--they both produce a wide range of tires of different quality and characteristics.
It would be helpful to know which model car you have, what kind of use it sees and what your tire price range is. Then specific sizes and types of tires can be chosen to compare.
www.tirerack.com is a helpful site for tire performance and value reviews. We would need much more information from you in order to produce a helpful answer.