The first kiln is designed
The first kiln is designed specifically for glass, and I THINK it has a controller (check on that). The other is a clay kiln with a “kiln sitter”. You can certainly fuse in it, but you are doing a lot of kiln-watching. I don’t know how familiar you are with fusing, but with glass, you ramp up and down at several different rates during one firing, to precise temperatures. You won’t have that kind of control with the ceramic kiln (the second one).
If it were me, I would purchase the first kiln, or hold out until a more suitable one is availble.
Jester’s Baubles Fused Glass Designs