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Steam Deck OLED announced
(www.steamdeck.com)
This is a most excellent place for technology news and articles.
If stability and reliability are paramount to you, you might consider getting the older version. At this point the hardware has been well tested and I feel like you might be beta testing less on a gen 1 vs a gen 2. That being said my personal experience is that I've never felt like a beta tester for valve and I'm sure you'll be happy with either. Cheers!