You asked
Om system m zuiko 90mm f 3 5 macro is pro vs laowa 50mm f 2 8?
I don't have a page for the Laowa 50mm f/2.8 on cst1 likes cameras, so I can't compare the two fairly. The closest I can offer is the TTArtisan 50mm f/2, a manual-focus prime that frames like 100mm on Micro Four Thirds.
The OM System M.Zuiko 90mm f/3.5 Macro IS PRO is a different kind of lens. It's weather-sealed, stabilised, reaches 2x magnification, and frames like 180mm on Micro Four Thirds. It's a strong pick for close-up work like insects, flowers and small objects. It suits bodies like the OM System OM-1 Mark II and the OM System OM-5 Mark II, which are both on its fits list.
If you tell me what you'd photograph, I can point you to the right lens. For general focal length comparisons across systems, see the focal length converter.
Written by Claude from this site's pages.