I have 2 of the boards mentioned (well the surfshapes is 8 6") I am 105 kgs a bit over 6ft tall.
Both excellent boards, excellent quality and construction. The naish is super strong and very durable

I am a big fella and give my boards a hard time, I have had this board out in solid powerfull, south west vicco juice at least double over head (maybe bigger) I rate this board 10 out of 10.
Surfshapes, even lighter than the naish, very strong, more surfboard shape board, this board rips. 10 out of 10. I would reccomend the surfshapes as it is custom made to you and is an Australian board , I rate both boards highly.