It really depends if you are going to tow at all or not. I have the Tow mirrors and love how much coverage they provide especially in the blind spots. I also have the Power Sliding rear window which is nice on the supercrews as there is no way I could reach back and open/close it if needed. If you have a supercab it wouldn't be as bad and maybe more worthwhile. The only benefit to the sliding rear window for me is venting and airflow as I do not use it to access anything in the bed. The mirrors even when not towing are nice and very functional... However the standard mirrors are also functional and sportier looking... If I had to make a call it would be the towing mirrors over the sliding rear window as I use the mirrors way more than the sliding rear window.