The Prinsu is great, but what I don't like about it is that it's really just crossbars across the roof where I found mounting things to always be more of a challenge than I wanted it to be. You can buy inserts to go between the crossbars but the pre-drilled holes seemed like they would still be awkward.
Gobi has the mesh steel (not sure what it's called) as the base where there seem to be mount points anywhere you want. I also wanted a ladder and to be able to walk around up there, where I wouldn't recommend that with the Prinsu. This Gobi also took ~5 months to come in, which sucked, and I also suspect the weight of it will be annoying. Prinsu is aluminum and super light. I also prefer how the Gobi looks, but that's subjective. Build quality of the Gobi is also clearly superior, and I haven't even fully unwrapped it yet.
I don't think you can go wrong with either, just as long as you know the pros/cons of each.