The Stylus/Mu series included a number of different models. The original had a 35f3.5 and the II had a 35f2.8. In addition (off the top of my head) the zooms were the Wide 80 (28-80mm) and a standard 80, a 70mm, a 105mm, 110mm, 115mm, 140mm, 150mm and a 170mm. It was an extremely popular, prolific and long lived series, so there were probably more versions. I wouldn't cast aspersions on any Zuiko lens, so your choice should be based on your preference prime vs zoom, and focal length.
Can folks PLEASE stop calling these and the XA's "clam shell" cameras?? Olympus only referred to the cover as a "sliding dust barrier". Heavens only knows who started the misnomer "clam shell" (and the related "cam shell" and "clamp shell"), but it was obviously someone who never saw a clam!