Declarations first = I own both these boards & I bought these boards with my own money, owe no-one any favors

They are both gr8 boards & highly recommended.
Strengths Manta 54 = Gybing & smooth handling in choppy water I thought the iSo 86 was the best board I had ever gybed, this one's even better!!!!
Strengths iSo 86 = Versatility Wide Wind Range & Top end speed, the board is fast
Weaknesses Manta 54 = Maybe a bit technical to get top end speeds, have to have everything set up properly and learn how to get maximum top end out of it, still havent quite sussed it out yet.
Weaknesses iSo 86 = Hard to identify any?
Manta 54 is superior to iSo 86 in the gybing department.
ISo 86 is superior to Manta 54 in wind range & top end speed.
They are both so good at this stage I cant depart with either, have to keep both, just 2 of those classic boards they just got right.