For me, the best racing is V8 Supercars which have already kicked off this year. Second round this weekend. Compulsory pit stops, tyre changes and refueling make for many different strategies, so you can be almost down to the last few laps before knowing who is going to come out on top.I've still got to wait till May for the touring cars.
F1 still holds an interest but with highlights only it's lost some of its appeal.
BTCC and the support races are good and a good excuse to just sit in front of the TV for nearly a whole day.
Not sure about Formula E. Great tech, but I'm not a fan of the barriers all round the circuits.

unless you've heard that scream first hand, you cannot possibly imagine , its mind blowing. 

I did get to ’hear’ some F1 cars BITD, which was, as you say, something to experience. I say ‘hear’ but you pretty much felt it all over.