It is easy; check my site :wink-wink
However to answer your question, the best performing for me are Bwin, Eurobet, StanJames & PartyPartners, in that particular order, they belong to 20-25 group.
Following are in 40-60 group; Betsafe, Boylesports, Expekt, Betsson, Interwetten, Bet-at-home.
Others are 100-120 or even more…
hope it helps :wavey: