Whats performance of GBA games played of Supercard MiniSD on GBA SP?

I have honestly no idea if console treats it as emulation or valid games from multi-game cartridge, would you please shed some light on this for me?

I guess this EZ Flash cart is better but its twice as expensive and I wonder why? I know its compatible with higher capacity SD cards but why would I need all possible GBA games on single SD card at all times anyway.