Zips are faster and easier to open than .exe.  But it really doesn't matter. I never install anything directly to my runtime folders anyway. I have a dummy folder on my desk top where I unzip or install each poser package too so that I can go through the contents, sort, move and rename things before I move it all to the runtime folder.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi