Powerpak style cart for Gameboy SP ?

I have seen a bunch of these on the internet but I dont know which one to pick. Are the more expensive ones better ? 



I want to be able to play and save  GB/GBC/GBA games. Do some carts have better compatibility than others ? Am I even allowed to ask about these here ? (I would assume that I can since we talk about powerpaks all the time which are essentially the same thing)





Thank You  NA !!





-Andrew

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