I tend to gravitate more towards the 7800.
Agree with River Raid.
If you weren't aware, very active homebrew scene for everything Atari. Check out below homebrews & licensed reprints from AA:
https://atariage.com/store/index.php?l= ... _list&c=21
I also always have to acknowledge Halo for the 2600 . Microsoft actually officially okay-ed this. It was developed by Ed Fries who worked at MS Game Studios during Halo Bungee times.
https://youtu.be/4GDZsFQ_haQ
I also enjoy Mario Bros on 2600 although much better on 7800. To see what the 2600 can be pushed to... check out Princess Rescue. Still impresses me!
https://youtu.be/o5igUFICNB0