Don't listen to them!
I mean I prefer Alder too, but basswood is just as good. It's a matter of taste. If the answer was "Definately Alder" there would not be so much guitars on the market with different woods. There are many great players like John Petrucci, Steve Vai and Satriani who play basswood guitars. Petrucci even exclusively.
What tonewood you like you should try yourself. Go play some comparable guitars with different woods. Best bet would be to check out the Ibanez Jem's as they are available with both woods.