So A1 and A2 are great cards for smartphones, console and steamdeck. But most A2 will be tied to UHS-III/V90 so in most cases A1 will do just fine. Especially since steamdeck is limited to UHS-I support. Personally i would go with 512GB since the transfer speed is higher @ 30MB/S instead of 10MB/S for the 1TB card.
However, games are made up of thousands upon thousands of unique pieces of data (whether as separate files, or combined to make much larger files), so when games are in their loading phases, chances are the Extreme will still out-perform the Ultra by quite a bit as shown by the bottom row in the table in the link.
There are lots of chances to save on SanDisk Ultra micro SD cards, with the 400GB card coming in at just over $60. 200GB for $24.99 with free shipping 400GB for $60.29 with free shipping
SanDisk Ultra vs. Extreme SD Cards Help! Question [UK] In terms of boxed sales alone, Super Mario Bros Wonder is the biggest Mario launch on Nintendo Switch, with
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sandisk ultra vs extreme switch