And why?
I'm using Sierra 10.12 right now.
(I could buy both and try out, but I'll try crowd intelligence first.)
BST was updated Oct-17, MGNT Feb-17 (how they could add HS support that early...?)
Crowd intelligence or heard mentality ? It's so hard to ascertain which is which these days.
Joking aside, what will proceed next is quite likely a set of replies with folk extolling the virtues of one while slamming or at least critiquing the other.
I use Magnet myself. It does the job. Better than BetterSnapTool? Well, it was a buck cheaper, so...
There are others as well, Hyperdock for example, apparently has windows snapping functionality.
I just looked at features listed by each tool, considered what features I personally needed, and the price.
Just take any preferences that may be listed here with a here with a huge block of salt. Everyone's different and, as a result, everyone uses their Mac differently from everyone else. What is a must have feature for one (be it price, snap positions etc.) will be ho-hum for someone else.