I take Jeter (and no I am not a Yankees fan). He will hit .40 points higher, and get 20 more SBs, and get more Rs. Yes Tejada will hit 20 more homers and get more RBIs, but in a roto league, 20 SBs will do a lot more for you in the standings than 20 HRs, and I will take the .40 BA any day since Rs and RBIs will pretty much be a wash.
The only thing I like about Tejada is that he always plays 162 games. Otherwise, he is a guy that had one really great year and some pretty good years, while Jeter is a more consitent performer.