I've been using emulation pretty much since I started playing games. It's actually one of the main reasons gaming became my passion (and eventually major money drain).
My favorite thing? I don't have to shuffle different devices to play everything I want - it's even more importent now, since I have a Steam Deck and can have all of them on the go again.
Here's a short list of titles I love that don't show up too often in threads like this one:
Tetris DX (GBC / mGBA)
Fantasy Golf Pangya (PSP / PPSSPP)
Persona 3 Portable (PSP / PPSSPP) - just started NG+ with female protagonist
Puzzle Quest - Challenge of the Warlords (PSP / PPSSPP)
Ridge Racer 2 (PSP / PPSSPP)
Parasite EVE (PSX / DuckStation)
Captain Toad Tresure Tracker (Switch / Yuzu)
I'm not going to dump my whole library here but these are fun and rare enough worth mention.