Not a stupid question.
I prefer fast acting complex carb sources as well.
If you’re looking in the grocery store, consider cornstarch.
It’s very similar to the popular waxy maize.
About two years ago I got some advice from a supplement company executive who told me of a double blind study they conducted using a leading brand WM product & plain old Argo cornstarch.
Guess which one produced better results.

I’ve never tried or talked to anyone who’s used potato starch, but I’ve sporadically heard of people using it.
There are a lot of trainers who’ve used waxy and went back to dextrose.
Try some different ones and see which you like best.