You can fit significantly more games on a single device, such as a phone's SD card for AetherSX2 or a PC's SSD for PCSX2 .
PCSX2 is the gold standard for PS2 emulation on desktop platforms. It offers near-perfect compatibility, upscaling to 4K, texture packs, and a host of other enhancements that mobile emulators simply cannot match. i--- Ps2 Highly Compressed Games Iso