Flo. I just think it's a better value for me. Many nights, both DV and Flo are on and I only have two eyeballs (and they both point the same direction) so I can only watch one. Flo being half the cost, many times the racing, and 25 other sports I can watch anytime are my reasons for choosing Flo.
I have FloRacing and Rally.TV, occasionally I sub to Dirtvision, but often I either watch the highlights on YouTube or wait for the races to be added to the vault. Other series I watch on non racing specific platforms, Sling, Peacock, Max, YouTube, and a couple series use platforms other than those.