Protondb reports is the only “surefire” way I’ve found tbh, since this is the kind of detail that gets included.

Tough one. I care a lot about game preservation, so I naturally tend to gravitate towards GOG, however I’ve had trouble getting a few too many games running, while the Steam versions “just work” (with the same version of Proton, etc).
I really tend to make sure that I’m not going to have any issues with the GOG version before buying it nowadays, otherwise I’ll get the Steam version.

512 OLED ordered 22 mins after launch in Canada, it was shipped (still label created when tracking with FedEx) about an hour ago now.

As the RetroDECK team, we are deeply concerned by the rumors about how others have handled their dependencies and their relationship with those developers.

I haven’t been following up with the Emulation scene on Steam Deck for a while, what is this in reference to?

I’ve been using this fork for a little while now (since v4, so about a month altogether?) and apart from having to re-enable my “custom language keyboard” (French QWERTY) after every update, I honestly have no complaints.
Autocompletion is miles ahead of offline Gboard for my use case (switching between English and French constantly).

Yep, completely fair.
They mention:

How long will DeckHD support the custom BIOS firmware?
We plan to continue providing BIOS firmware support for the foreseeable future. We are also optimistic about having the opportunity to work together with Valve to release official BIOS which natively support the DeckHD screen.

Which sounds to me like they haven’t reached out to Valve and there’s pretty much no chance of that (EDIT: official BIOS support) ever happening.

It’s the exact same size.

If I already own the game on either platform, that’s where I’ll play it. I also don’t emulate the Switch on Deck, as (and although) I have a modded V1 that I can OC and a Lite for portability’s sake.
I especially prefer playing TATE Mode shmups on Switch with my Flip Grip, it’s a game changer.
I also tend to favour physical games overall, so I might buy games on Switch more often than not (unless there are significant performance differences).

I’m in the same situation, the Deck has been my only PC for about as long as I’ve owned it (first batch, so about a year and a half now) and it’s more than enough for my use case.