First option, I usually play on satoshibet, and I get 500 sat faucet(0.005 mBTC), I have withdrew 0.5mbtc for 2 times from there, and I only bet on the tiny faucet money, the withdrawal limit is 0.3mbtc, so I think you can also try it.
I support arallmuus, he said fortunejack and coinroyale, yes, their bj are good, but I don't have good luck there, I only have good luck on satoshibet, and SB's house edge is 0.37%, very low. Expect return is 99.63%.
My luck on SB is really good, I get 16, and dealer gets K, so I need to hit, and I get 21, dealer get K again, I win.
But when I play in fortunejack, I got many times 19, 20, or even 21, but the dealer can get better, and 21 VS 21, player lost there, so FJ's house edge is higher because 21 is losses but generally should be a tie/push.