In my expereimce I have found that APC props are way better on smaller glow engines and also some bigger ones. While everyone can debate this until we are blue in the face [&:] I'll use real world examples and we will not quote RPM figures

Lets take my Showtime. It's powered by a YS110 and everyone agrees the APC 16X6 is the prop to go with on this engine. Now when I first flew this plane I had the APC 16X6 on it and vertical was great not unlimited but great. It was fairly quiet and spool up was pretty good but it built to much speed for the airframe.

Someone suggested I try a wood prop so I found a Pro-Zinger 17X4 and put it on. Now my vertical pull was fantastic but two things happened. I lost the amount of vertical and the engine could break the prop loose (you could here this happen) and the plane would literally quit pulling and it got quite a bit louder, but the time it took for the engine to get to max rpm was greatly improved which is what you want for 3D. So now I plant the plane into a hover at about 20 feet and firewall the throttle, the plane starts pulling hard and within a few seconds the prop breaks loose and the plane all but stops. YIKES, this is not good

So I land and replace the prop with an APC 17X4. Now it's back to being really quiet and spool up is still pretty quick so I hover it again. This time when I punch it it rockets out and just keeps gaining speed and altitude.

I did similiar tests on my Twist wth an OS46AX, An OS91 FS, A Saito 100, OS108 and a few others. In all of it APC always seemed to give better pull and was much quieter. It cost me a bunch of cash for testing but I always came to the same conclusion. I also tested MAS props in some cases and everytime I could break the prop loose and it had not near as much pull as the APC. Now APC pops are heavier so take that into account if you use them.

Now only if Bambula, NX, MSC, Bolly and Mezjlik and the other high dollar props came in smaller sizes. I use strictly NX and Mejzlik props on my gas engines and the NX are wood and nice and quiet but pull like there is no tomorrow and the Mezliks are CF, look cool, pull like you would not believe but are somewhat noisier.

It all boils down to what others have said, test several props and see what works best but stay within they manufacturers recommended sizes