Those are running through the USB system, so there will be at least a couple milliseconds of delay before the signal gets from Linux to the FPGA. The SNAC adapters are effectively zero latency. In practice, however, 2ms of latency will not matter at all. Plus, you can't use SNAC controllers with the main menu system; they only speak to relevant cores.
Because the adapters route via USB, you should be able to control not only the menu, but also other cores, as long as you have enough buttons. You can also probably connect more than one at a time. SNAC adapters have to be swapped for each core, which is a pain.
If those work as advertised (and assuming I'm understanding the broken English correctly), they look like a good solution.
I'd heard about Daemonbite adapters, but had never looked them up before. Now that I've found them to refer you, I'm realizing they're similar enough that the ones you're linking here might be copies. The Daemonbite person publishes their schematics, so these might literally be the same thing.
Official Daemonbites are a little more expensive, but come with enclosures, which I think would be an important usability feature.
The schematics are here:
https://github.com/MickGyver/DaemonBite ... ollers-USB
and there's a link in the readme to take you to the Daemonbite store.
Dunno nothin' about Atari paddles, sorry. I'm sure they would work with SNAC, but I dunno about USB adapters.