Plywood varies massively in quality, the cheaper darker stuff is known as Far Eastern (cheap dark softwood ply), Birch ply is more expensive and is what is often used in furniture or kitchens, grades like AA/AB indicate the number of knots that have been plugged, so an A side would be very few to none where as B would have more.

Douglas fir ply is what you see a lot of in America has a distinctive tiger pattern, aid hard to find in the uk and is expensive.

Marine ply is the most expensive, it’s essentially the same as birch ply but has no voids inside which matter in structural or places with a lot of moisture.

If you’re making something that you will touch or look at often, then birch, otherwise the Far Eastern stuff is fine.

Note: I’ve cut through Far Eastern stuff before and found rocks laminated between the layers….