Which token is best to mine with? I think mining with TRC20 USDT transferred in from Tron network is best. Super cheap transfer (possibly free if you have energy). Remember, mining isn't about making money, you will lose it, so it makes sense to mine with a currency you don't mind losing. In other words a currency that you don't think will go up in value. The crypto bull market wont last for ever, but for now USDT seems like the best choice.
Separate topic, but I think it would be good if BetFury pegged the mining rate to USD for stability. It seems like everyone was mining/gambling and then BTC price went crazy high and now it scared off a lot of players, especially new ones. The profit pools have shrunk, or stabilized and need help to grow again. I understand they have to peg the rate to one currency and you cant always predict what its going to do, but mining difficulty will naturally go up over time so why would they make the mining rate go up super fast by pegging it to such a volatile currency. I understand this would be a big change and would need to be done as not to make players angry, but maybe they will work towards this now that the two BFG tokens have been merged.