Difference between SQL server 2008 Sp2 standard edition and 2008 R2 sp1 standard edition

Hi All,

If there is a big differance between  between SQL server 2008 Sp2 standard edition and 2008 R2 sp1 standard edition. please sned me wt kind of changes have between them. because my system can upgrade only to the 2008 R2 sp1.

Thanks,

robb