Steam Deck VS rivals

I was interested in buying a Steam Deck... Until I discovered all the (apparently) better alternatives. Asus Rog Ally, OneXPlayer, Aya Neo etc... I like the idea of an handheld console and obviously I would like to have a device that can run almost everything, so the Windows based handhelds seem better than the Steam Deck. Is it true? Furthermore the Steam Deck looks really big compared to some new devices out there (eg the OneXFly) and neither I like the screen of the Steam Deck, apparently of lower res and with very big bazels (to me looks like the first Nintendo Switch). On the other hand, I think Valve is a more serious company than (apart from Asus) some other unknown Chinese company and I expect Valve to deliver a better product. Still I'm not convinced of Steam OS compared to Windows 11, since I would like to play also Epic games and maybe some emulators. So I started getting information about the alternatives and... There are a lot. There are so many that I got overwhelmed. If you go to the OneXPlayer website they sell like 3-4 different handheld consoles, Aya Neo even more and they also have IndieGoGo campaigns running for new devices, all with weird names. I can't understand what's the device right for me (and I really don't understand their business model). So my question is: are the rivals of the Steam Deck worth their price? Are they really better than the Steam Deck (in terms of quality, screen, size)? Thank you for your opinion!

UPDATE: I finally bought a refurbished 256GB Steam Deck.