Well, here in the 21st century statistics like On Base Percentage and Slugging Percentage (and the two added together) are far more telling than RISP or RBIs. They give you some percentages of the batter's success at the plate.
I'll bold the leaders in each stat to make it easier for you..
Rodriguez- .421 OBP, .610 SLG, 1.031 OPS
Ortiz- .397 OBP, .604 SLG, 1.001 OPS
As for the part I bolded in your post, isn't it a clue that you need to go looking to some nice stats for Ortiz? Rodriguez led in 8 major categories (including the 3 most telling which I highlighted), Ortiz led in RBIs, doubles and walks.
http://www.hei.lv/labirints/bildes/head_up_ass.jpg