Both work, they're all just sending digital versions of notes! You can find one for every perceivable amount of buttons you might need. My hobby is electronic

Both work, they're all just sending digital versions of notes! You can find one for every perceivable amount of buttons you might need. My hobby is electronic music, so I tilt towards grids over tiny pianos (though I own both). The smallest one I own is AKAI LPD8, which gives me 8 buttons, 8 knobs, and a couple of modifier keys for less than half the price of a Stream Deck. It's not that Stream Deck is particularly expensive ($150), but I just can't justify it to myself when I'm aware of all the MIDI controller marvels you could get for like $100.