I was at Brands and it was the first time I've seen the DTM cars in the flesh. I thought it was a great day and the support racing was also very good.
I find the big(ish) fire breathing V8's far more of a sight than the BTCC but as everyone says, they are not really to be compared. The BTCC is a superb sight in it's own right and much closer racing in my opinion.
Maybe it's just the fact that the DTM series is 'exotic' in Britain and makes it more of a 'must see' show.
Whatever you think, just be grateful that you can see both in the UK at Brands. What more does a petrolhead want?