Each type of racing has its own plusses and minuses. F1 is not fan friendly and often boring to watch, but a few good races a year make it worthwhile. NASCAR is all about crashes and smashes and that's fine, but it's not exactly high-tech.
I find myself being drawn toward the ALMS series more and more. I enjoy the action all over the track and the strategies that come into play when P1 & P2 cars have to deal with GT1 & GT2 cars while racing in their own class. If I tape an F1 race I usually watch it once. I can watch an ALMS race several times and not get bored.
With F1, the best video is the 2 hour highlights that are released at the end of the season - it cuts out all the boring processions.