Question Am I best using more then one sd card when using emunand?

The hidden partition is the actual emunand. A partition that is not readable by windows that acts like the 32gb nand of your switch. It's hidden to allow you to format the regular partition (the rest of the card) without having to move the emunand files back and forth. It's not hiding anything from Nintendo.

You can you two cards, or not. It doesn't matter. Nintendo does not scan sd cards.

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I assume you are using Hekate. The hiding 32GB partitios will contain the actual emunand. The rest of the space, the "redable partition", will be use to contain all the needed files plus your homebrew and installed XCI/NSP/NSZ games.
Swapping between cards can become a real pain in the ass really quickly, so I suggest you to stick to only one and put everything there.

 

Realistically it shouldnt matter, at this point even a hidden partition is unnecessary.
People have used emunand on single sd cards and as files for years(no hidden partition).
Unless you believe nintendo would start scanning the contents of your sd card(which falls into the highly illegal side of the law),
You won’t get banned if you use it correctly.

 

Why make life more complicated with another SD card?