Im not familiar with the st2 but it does look cool.
I saw the vf1 and like the fact that I can buy the kit and build it myself.
If I had to bend all that stuff I'd screw up.
The vf1 has everything laser marked for easy line up and part identification.
There also seems to be a decent builder coalition to help with issues.
My .02c
The appeal to the VF-1 by comparison is it was designed to be modified with ATV parts out of the gate for the front end and I guess the rear too. He was nice enough (as far as I know) to include pretty much all the dimensions needed for having it sent off to be CNC cut. I have tried contacting Badland a few times since I got the plans for the CAD files for parts to be CNC cut out and no response. I could draw them back out in FreeCAD but that will take a while.
Still waiting for summer to be over so I can start rebuilding the engine. I will be doing new pistons, rings, etc. Also doing a good honing of the cylinders. This buggy will definitely be a MK-II compared to what Badland came up with 22 years ago.