There's no dispute over the technical behaviour of the Dax as against the FTSE (or the Dow for that matter). If you trade on TA signals alone, the exact instrument isn't too important.
But should we not remember that its not just the behaviour of the index that is a factor here, its also how the SB companies move their quotes. Its not unusual to find e.g. finspreads quoting the FTSE monthly bets 10 or 20 points adrift from the actual value of the index. That's one heck of a bias if you get direction wrong.
But is there an instrument that the SB companies don't price so aggressively? One they ignore a little, allowing us an edge? Have members found an area we can "hit them where they ain't"?