For what it's worth, I already own a 1-chip snes, a framemeister and the rgb cables, yet I still ordered a super nt for convenience and added features.
I also occasionally have issues with my snes where if the cart isn't shoved in just right and tilted slightly towards the front the game won't show up on screen.
I don't think it needs to be either have one or the other, and both are great options.