i say yoyo's cause they are way more hardy, i've had them in my tank since the beginning of my hobby from 10 years ago, that's right, the 5 yoyo's i have are 10+ years old (been in 3 separate tanks as i upgraded) and they've never had ich while everyone of my clown loaches have manage to get it. they never get eaten and they are much more social towards other yoyo's than clowns towards other clowns. BUT they do hid most of the time and i think that's just natural for them.
How big are your yoyo's now after all those years. I have 5 Golden Zebra loaches about 5 years old and about 6"-6.5" long, and 6 Reticulated loach (yoyo cousin) ranging from 5"-6" and 2-3 years'ish of age.