Which is good to have to go along with Smackdown Vs Raw 2009? 2007 or 2008?

Plus for 2007 and or 2008 which one has the better season mode along with 24/7 and GM mode? I know that 2007 has the last appearance of Chris Benoit and Cactus Jack and Dude Love and Mankind and other Legends but 2008 does have more Legends like Bam Bam Bigelow I think? along with Bret Hart in 2008.

Doesn't Smackdown 2008 still have Kurt Angle or just Smackdown Vs Raw 2007?

ok thanks but my question still stands. Which to get for the PSP? Smackdown 2007 or Smackdown 2008. I wouldnt mind getting 2007 since it has Chris Benoit and Chris Masters I think or just Chris Benoit before the makers got rid of Benoit for 2008 and 2009