I like both. Wood is aesthetically pleasing. Rubber / Synthetic is better for wet, cold, inclement weather and for needed retention and recoil mitigation for heavy loads. The rusting matter can be a problem. I used the Pachmyr grips for work. I was out in the weather (rain, cold some snow) and found the rubber was perfect. I was able to keep rusting to a minimum just by removing the grips for a wipe-down and light lube during routine cleaning. But, the routine cleaning must be done as a matter of regularity. Otherwise rust could form. Rust can form under wood also if your sidearm is subject to inclement weather....

I am partial to Hogue wood grips as well as Mustang and Herrett's. While most Smith and Wesson grips are beautiful they are too big and not slim/tapered enough for my hands. I like checkered wood too so as to have a surface to hold on to while shooting. I would not throw away the rubber grips. They do have a purpose and utility.