I always felt limited by the 2600 and wanted to move onto something bigger. But by the time the NES became popular, I was into ST and 16-bit gaming-- RPGs, sim games and so on. Then my friends start getting NESes, and suddenly we're back to 8-bit graphics, and 8-bit music- I thought I was past that! Worse games like SMB were too bright and colorful, and the music too bouncy and happy, I was a moody teenager and couldn't deal with that shit! I kind of liked Castlevania because it was a darker game, but almost everything was a side-scrolling platformer, and I wanted more variety.
So I never could get into the NES, I'll have to go with the 2600.