Depends where you are, what's legal in your jurisdiction, what kind of markets you're looking for and how important bonuses etc. are to you.
Generally speaking the "best" site is Pinnacle: their claim to fame is offering the highest limits with the lowest vig, and not banning winning players. Their focus is on the main markets though, so if you're someone who wants to bet a lot of props or novelties they might not have a lot of options for you. And they don't offer bonuses etc. because they don't need to, they're not targeting the recreational bettor.
I live in Australia and in addition to Pinnacle I've never had any issues with international operators like betfair and william hill in terms of getting money in and out, but the industry is very heavily regulated for things like that in Australia, so it's never even occurred to me that there could be a problem.
Bet365 and Pinnacle i would say.
Never had any problems with bet365. Also they have really huuuge offer for all sports.
Nice odds and ofcourse no problems with withdrawal.
Bet365 there's everything on it, best mobile App, but it's too easy to bet if you know what I mean? So much tentation.
Marathonbet got the best odds and for skrill withdrawal its 15mins max , no matter the amount , however their new interface I'm not a big fan and the mobile app is poor.
Unibet got decent promos and nice interface , lot of markets fot football
Im a fan of 888sport. If you already play poker on 888 then you should recieve freebets amd sports bonuses from time to time which is great for increasing the bankroll. Your balance for poker can be used for sports and vice-versa.
If you havent signed up for 888 yet, you can choose either the sports welcome bonus (30$ freebets) or the poker promo (100% deposit bonus). Withdrawal shouldnt ba an issue as 888 is a large a trusted network.
Marathonbet got the best odds and for skrill withdrawal its 15mins max , no matter the amount , however their new interface I'm not a big fan and the mobile app is poor.
I know a lot of sporting sites, they are very good and very bad. First of all I like the good live betting sites, the best I think is Bet365, Unibet, Pokerstars.
From this point of view, the worst I think is Americas cardroom, Black Chip, Betonline. for a long time the options are suspended, there are few bets, no live coverage.
I have had good results with 5dimes, few small deposits into some good parlay cash outs. Have not been banned from their book yet for "winning too much"
I use poker stars. Since not long ago the have Sports Betting. So I use the same place to play Poker and bet on Sports. Great decision by them doing that.
I won several times and sell some dollars to some friends. So far is working great to me.
Cheers,
M.D.