Atari announced a partnership with Playmaji, Inc, the creator of the Polymega. The Polymega is a retro game machine that allows for additional modules to adapt the base device into different cartridge-based consoles.
The partnership includes strategic initiatives that will provide support for Atari games on Polymega hardware and software and integration between Polymega and the Atari VCS.
The Atari VCS will add support for the Polymega App and the Polymega Remix add-on. This will effectively provide all of the functionality of a Polymega console to Atari VCS owners.
In addition, a new cartridge module will be developed that will add Atari 2600 and Atari 7800 compatibility to the Polymega console. The addition of this cartridge module will make Atari’s 2600 and 7800 games more accessible to retro enthusiasts and expand the market for Atari’s line of collectible game cartridges.Yahoo! Finance
The Polymega is an expensive console, where the Atari VCS can be purchased for less than $200 on a regular basis. Atari games are not expensive, and neither are the consoles. There are countless ways to play Atari games today, that cost next to nothing.
Start with the Evercade and go from there. The Polymega would be my last choice.