if u cud afford both i'd do peng. I've heard how much catagni frames you have to turn twice the amount you want because of the inaccuracy which to me is BS it's 2017 he needs to get updated frames like everyone else.
Catagni is as updated as it gets. With his device(HEF), aside from the other benefits, you actually 'lose' less than you would with any other external device. He is however very realistic and will let you know that it's possible to gain around 1-1.5 cm less than what you turn. I myself turned 6.4cm and had an actual gain of 6cm.
Aside from that, he constantly has a stream of doctors from all over the world (including Paley at one point) coming to study under him.