They look pretty similar, and the Geo also looks comparable.
The Carbonda comes with Seatpost and handlebars + all the accesories to mount these, and I am sure that everything will fit together. Price would be around 900$ with my chosen color.
The BXT comes without these accessories and parts, so I would have to spend at least another 200$ to get the same, and could run into troubles making everthing fit together. So I would end up at atleast 650$ here, which is not that big of a difference.
I will get the Carbonda with chosen color, I think I will be more happy with this, even if it is more expensive.
Does anyone know, if Carbonda ever has something like a sale sometimes? As right now ICAN, Elitewheels etc. are all giving discounts.