I can't decide if the SMS version is better than the NES version

SMS
>a few new or different levels
>a few new or different bonus stages

NES
>better music
>higher resolution
>less lag (I think)

I think some of the additions or differences in level design on SMS aren't that good, the rotating tree trunk bridge was especially awful for instance. The vertical scroll with the lava rising was cool though. Either way they're both good, playing the SMS version made me feel like playing an alternate dimension of my childhood.