AMF Roadmaster!
If I was going to rank my favs in order of reliability and build quality it would probably be something like this...
1. Puch w/ E50
2. Tomos w/ A35 or A55
3. Puch w/ ZA50
4. Honda PA50II
5. Peugeot 103
6. Motobecane AV10
7. Motobecane AV7
8. Tomos w/ A3
The french bikes have a special place in my heart and are soo fun to ride, but they are more work when compared to my top 3. I have a motobecane and I like the looks of it, but I think peugeots have a better design from a mechanical perspective.
I haven't worked on or ridden any derpis/minerallis yet I'm guessing they'd be on my list if i did and I'm not too impressed with morinis, sachs, batavus or vespas(i kinda like ciaos though). (edited)