Looking for some advise on CAR AUDIO...

I have a MTX crossover hooked up to gain more bass through my WOOFERS..
Now I am considering buy a EQ with a built in crossover...
The model I have chosen has seperate for MIDs, Highs and LOWS...

Now the store selling this ITEM says this is better than the crossover...

I went to a CAR AUDIO place - and they say that the Cross over is better....

Can anyone help !!!

THANX