ON3P website has lots of info on it for all their skis. Weight, turn radius, effective edge, flex, etc.
All that to say both Magnus skis are primarily park skis with stock detune underfoot, tighter turn radius and a more forward mount.
Jeffrey skis are all a bit stiffer and real stable, have a longer turning radius for goin fast, and set back a bit more so you don’t get over the tips as much in chop or pow. This makes them super capable all over the mountain but poppy as all hell so everywhere becomes your park. Also the park can be your park.
Depends what you’re into. I’ve heard people say if you’re 70/30 park to all mountain go Magnus, and 70/30 mountain to park go Jeffrey.