Best CRT for PS2/Genesis?

Hey everyone,

So I'm currently in the market for a small CRT what can display PS2/Sega Genesis games in the best possible way (they look like shit on my 4K TV).

I don't want something massive/bulky, so I'd rather keep it in the 20' range and as small as possible width wise.

So would I be fine picking up any old CRT whats 20'-29' or should I be aiming for a certain make & model?

Thanks everyone