Rakza Z vs Rakza 7

i have a friend whos been playing for a year ish and hes looking for a forehand rubber that will suit him and i've narrowed it down to these 2 rubbers but dont wanna let him down on the final decision so please give ur information u have below (preferably from ppl who have experience with these 2 rubbers)

info: he wants a rubber that will allow him to create very heavy backspin serves, and a good touch game but doesnt have good forehand looping technique