I know quite a bit to be honest with you. Chelsea is the better pick, but the odds will be small, I was recommended by a pro to put them in a double with Arsenal. Arsenal should win, they beat the champions of the Turkish league Fernabache comfortably in both games in the qualifiers last season and Besiktas are traditionally worse than them and Arsenal have strengthened during the summer transfer window. Arsenal have always qualified for the champions league, if they don't this year would be a huge shock. It's 2 legs though and they start away so it isn't a given but that means the odds are a bit better, they should do it in theory, you'd think what they have would be too much for Besiktas even away and Arsene and Arsenal have a HUGE desire to qualify. I watch every Arsenal game as I'm a fan, they beat Crystal Palace on the weekend, but they beat them late, still looked a little rusty but they weren't bad. Demba Ba is a good player for Besiktas though. But still I maintain a Chelsea and Arsenal win, Chelsea are very likely to win, they have reinforced hugely and are playing a newly promoted side, I imagine even the odds reflect this. For the more advanced gamblers could even consider a win by 2 goals type bet. But Chelsea today should win against Burnley, Arsenal the next day are favourites but it isn't as clear cut.. Of course they could both fukk up as that's why it's gambling, nothing is guaranteed, but with my knowledge I'd be backing Chelsea and Arsenal...