I recently was deciding between the Steam Deck and a Switch 2, and at the end I chose the Switch 2 because of the lighter weight. I thought the Steam Deck would be too heavy for my weak hands. After spending some time with the Switch 2, I found it also being too heavy for longer gaming sessions.I bought a grip case to make it more ergonomic to hold, but still it gets tiring in less than an hour.
The Switch Lite has the perfect weight, but too many games have tiny text and UI designed for bigger screens.
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I love my Steam Deck and it's my most used device. I love its ergonomics which make it easy to hold. But it's a tad heavy.
I usually have it on my lap or a pillow or something and it works out fine.