I looked up the specifications of the 7800, the NES, and the SMS.
The 7800 is amazing! It can draw many more sprites on screen than the SMS and NES can. It also has a much larger palette of colours than the SMS and NES.
What amazing hardware! I suppose the only drawback is the sound chip, which is virtually the same as the 2600 - but honestly I couldn't care, I love the 2600 sound the way it is.