What? I meant that if you predict the ESTX50 correctly then the chances are very high that you also predicted the CAC40 correctly and high that you predicted the DAX while on both of these futures contracts the execution costs are lower if you hit the bid or take the ask.
One can find a preference for estx50: estx50,cac40 - 1point = 10eur fdax - 1point = 25eur fdax can move a lot, margins much greater cac - different exchange ok, bid-ask spread is greater but it depends on what kind of move you want to catch