Version of Megatron plz. Bayformers would not last too long, Ultron has too many ways to exploit his vulnerability to thermal weapons. TF One megs is more adaptable and has superior overall firepower to Bayformers Megs and can put up a much better overall fight. G1 Megs can level mountains with his fusion cannon and has survived energon explosions that can shift planetary bodies out of their orbit at ground zero. Farr too much firepower and durability for Ultron to handle normally.