I'd have said hack hands down everytime.
But just this week I've used the gymleco pendelum squat and it's a fantastic bit of kit!! I've never felt such great connection in my legs.
The gymleco hack is great, it has a really small foot print, literally takes up no room, the only issue is there are no safeties and I cannot bottom it out so I'd get pinned if I fail in the bottom. The pendelum squat does have adjustable safeties, and whilst it has a bigger footprint than their hack it's still relatively small for a pendelum.