The Atari 5200 console and games
The Atari 7800 console and games?
To put it in simple terms for this thread, discounting discrete (inferior) arcade ports there's only a literal hand full of exclusives for either platform period. The 7800 is probably slightly more worth having assuming you have an Atari 8-bit computer already like an XEGS or also if you have zero Atari systems and only want one.
Fuck you, both had great games held back by really bad choices for hardware. Pretty sure the 5200 was meant to be a prototype the retarded execs decided to just rubber stamp without testing the damn thing as originally intended.