Critical Reasoning

I'm finishing up studying for SC in a few days and wanted to get input on which source I should use for CR. I had used MGMAT SC but there was still significant gaps in my knowledge upon completion of the book, I then bought the eGMAT SC course which filled in the gaps. Since CR isn't about concepts(like SC) and more so about strategy, I wanted to find out if MGMAT CR alone would be sufficient or if I should supplement it with eGMAT CR course as well?