There is the OLD ('50s) Yugo stuff, and there is some newer ('70s) floating around. Apparently AIM was selling the '70s stuff a while back, but ran out a while ago[before I bought my 8mm; a M24/47]
The only Yugo on the web available for order is the '50s stuff. Some people have complained of overly hard primers, coupled with old and weak firing pin springs causing FTFs. If your spring is good, or you buy a new Wolff one, you should be g2g.
There is really no diffrence between clipped and no clipped. It's usually the luck of the draw on whether they are on clips or not, unless the seller states specifically whether they have them or not. I know when I got my 8mm, SG(before they went down the tubes) had Yugo, and they stated some cases are on clips, some aren't- no choice.
I ended up just getting the Romanian surplus stuff. It's lacquered, and shoots rather dirty, but has been nothing but 100% reliable. Your elevation settings will be off, because the Rommy stuff is mild steel core, while the Yugo is lead. I am very satisfied with the Romanian.