I don't know if there is one right now but let's say a team has 1.70 odds at almost everywhere, or around that level, sometimes you can see as high as 2.20 here for some reason, just because the other side got a huge bet from someone that increased the odds. That is something we as gamblers can take advantage of and make it a profitable thing by basically "arbitrage" our bet if that is even a word for this.
Yes, since freebitco is using a different system for determining the odds, you can take the advantage of different odds. But you should keep in mind that odds shown on freebitco can change even after you make the bet. So, you cannot decide base on the odds you see at the time of betting.