PSV is dead, unless you jailbreak it, it's not worth it, not to mention it's propriety super expensive memory card, I haven't touch mine for years...

3DS also is slowly phasing out by Nintendo, once a while am still playing it, but once you're used to the NS's screen, there's no going back

Switch (NS) is the king of portability now, why not considering it?
Have you tried it? some of my friends are skeptical like you also, but once they borrowed mine during road trip, they're hooked and bought theirs

you can hook it up easily to the hotels' tv as well, get a supported usb-c - hdmi dongle if you don't want to bring the dock.
and it's more fun to share the joy, lots of the games are local multiplayer supported, easy to play with your friend on the go.