Second.
I used Kaplan videos through second year, then did them again to prepare for Step 2. I purposefully chose 2 months of easy rotations (9-12 radiology, family med with a guy who works 3 days a week) so I could use the afternoons to watch the videos.
The Kaplan preparation is extraordinarily good. DIT is mediocre at best. Anybody can read Step Up themselves and do some Uworld questions. If you had the discipline to watch the videos already, you likely don't need the structure that DIT provides (the real benefit of DIT is not the knowledge, but the study plan), and would probably benefit from learning more information. The way you go from 230 (average) to 250 (1 SD up) is by knowing the extraneous stuff, the stuff that just isnt covered in DIT or Step Up, that IS covered in Kaplan.