My choice for best sports gambling websites that use cryptocurrencies are:
1. Sportsbet
2. Stake
3. Fortunejack
4. Roobet (recently started with sports betting)
5. BetFury
Really good list and clearly visible that you have some experience with each of them.
Sportsbet have good odds and no withdrawal fees, and Stake sometimes have better odds on some sport events and live broadcasts.
Personally, I use stake for UFC and MLB bets because the odds are really good. While I use sportsbet for markets where odds are the same on all sites because boost helps get better odds. Then Sportsbet also has free withdrawals like you mentioned but now days I am using TRX so fee isn't much of an issue.