Betfair user for as long as I can remember (since early 2000s).
I haven't used the two Bitcoin sports betting exchanges mentioned here, but neither really look anywhere close to the experience.
It took awhile for Bitcoin sportsbooks to get close to the likes of bet365 (IMO they are still a little behind, but closing the gap fast). I fear it may still be awhile until we see a Bitcoin sports betting exchange that can compete.
Would be happy to be proved wrong...