Replying to Line mastermind or afterbang

hey i am either going for the line mastermind or afterbang size 177. i had the 155 afterbang last year and it was kind of heavy and stiff. i ski mostly park and about 60% rails 40% jumps. this is my first year of skiing park alot and i am an aggressive skier because i just quit racing. im 5'10 and 150 lbs. i am wondering what ski i should get because the mastermind is alot lighter then the afterbang but the mastermind doesnt have butter zones/carbon ollieband. has anyone skied the new 177 afterbang? are they more flexible then the 155s?what ski is better for learning new tricks and progressing?