I believe that .325x8 will be faster in smaller wood, provided it is Stihl RS, because of more cutters. Other .325 chain have smaller cutters, which will at least partly outweight the higher number.
3/8x8 will give you higher chain speed, and is another option in smaller wood.
In larger wood, when chip clearance becomes a factor, I believe 3/8x7 will be better.
Forget .325x7.
This statement is based on tests made by former member Glens, and common sence. I have not tested it myself on an 036.
There are also several other factors that will enter the picture, so the only way to know for sure is to try it yourself, in your own wood.....
Personally, I intend to stay with 3/8" on my MS361, after considering to try .325x9 on a short bar for a while....:rockn: :rockn: