Why is Cobra so Much Better on the Spectrum than the C64?

Cobra on the Spectrum is a masterpiece of an arcade game, but the other versions.... aren't.

Why is this?

Kim Justice's Joffa smith Documentary: https://www.youtube.com/watch?v=oRFY2orHo3o
The reviewer who got really put off: https://www.youtube.com/watch?v=vGlLpbCiYzc

Видео Why is Cobra so Much Better on the Spectrum than the C64? канала Starved For Time