Exactly. That's the only offensive category Drew has been better in. (with OPS being a function of that). Mags has been just as good or better in every other. Of course, the biggest difference is playing time.
Also, one thing to consider about the RBI differences, Mags has been a much better hitter with RISP. Drew has posted almost identical number with RISP as his career stats overall (0.279, 0.408, 0.486, 0.894). Mags has performed significantly better than his overall career numbers with RISP (0.331, 0.406, 0.530, 0.936 ). Driving in runs isn't just team dependent, it also depends on how well you hit in RISP situations. Mags has been great.