First off, I think you should definitely invest in BC and Mikes comes with that. I got Chad's on top of BC and I really liked his gen chem videos. He didn't go over some basics like empirical formula but you can always just watch that video on Mikes. For ochem, I started watching Mikes and it was good. The only thing was I didn't grasp the info that much with Mikes so I only got 19s on my BC Ochem sections. I just started watching Chad's ochem videos and I think it was the best decision I've made. I understand the material and concepts a lot more than I did with Mikes. That being said def invest in BC and if you can I would def use coursesaver for Chad's. If you can't spend the extra $50, Chad has the videos on his website for free, its just that those are way longer and cover a lot more info I think (i haven't watched them but theres 20 chapters or something instead of the 7 chapters on coursesaver)