sevo
Fokutorendaburando
Some have a Schneider Variogon lens. Others have a Rollei Phototechnic VarioApogon lens. I have no idea which lens might be better.
They might be the same - Rollei and its associates often changed hands, and with each owner, different branding rules applied. IIRC the Prego 90 was made (or at any rate distributed) by Samsung (then owner of Rollei), and the lens was made (or branded) by the then Korean Samsung-Schneider joint venture, which eventually reverted to Samsung only, along with Samsung divesting itself of Rollei as well. At any rate, after that point, Rollei and Schneider had separate owners, which may have prompted a renaming from Schneider to Rollei (a renaming to Samsung on a camera touted with vague hints of a German origin would have been damaging to its sales).