AMBA is popular because of the ARM core.
Wishbone is popular because of opercore.
but which one is more popular in commercial products? I think it's obvious.
amba is an industry standard. it is open. but the arm instruction set is not free. if you want to use the instruction set, you have to buy the license and it is much expensive. in fact, it is almost impossible to afford the license fee. generally, most companies license the arm cores.