It really depends on personal preferences because the black 2 seater looks more like an off road type ad te single seat one looks like a on road Cruz type but it's just my opinion so good luck on the decision
Neither one of them are really "off road" go-karts. You'd want something with shocks in front and back to really have a good off road kart. Id go for the one with the most powerful motor that runs good and is comfy and fun to drive.