Depends what kinda resolution your running at and the quality of your monitor. But in general it's pretty safe to say the the Radeon offers far better 2D then your Creative card. The GeForce line has long been somewhat maligned for their poor 2D, and Creative Labs is worse then most in that regard.
ATi's Radeon series has always offered excellent 2D visual quality.
Like raspewtin said, 2D quality varies considerably between manufacturers of GF cards. The majority seem to be rather crappy in that regard, but there are a small handful that are decent.