I want to buy my first Zoom MFX but I am stuck between choosing the G9 or the G7 .

1.) I would like to know if the 28 extra effects, the second tube and 3D expression pedal is worth the extra $$$$?

2.) I would really like specifically to know does the second tube really make a big difference to the overall sound?

3.) I have a Ibanez ARC300DVS going into a Marshall AVT2000 100watt amp with a 12" Celestion speaker and will the Zoom G7 or G9 compliment my hybrid amp and overall setup?