We had a good thread on this topic a while back started by Patrick Johnson. It turned into a monster thread...
Anyway, he had a very simple test where you hit the cue ball one rail with spin and note where it ends up. You would then do this with several cues and compare results.
To control the experiment with methods we could all use (free):
1. A centennial object ball was used as the cue ball, with the instruction to hit it on the tiny triangle it has by the numbers. After the shot, only if the chalk mark was EXACTLY on the triangle would the shot count.
2. Interfering object balls were set up surrounding the path of the cue ball. These insured the cue ball took the same path prior to the 1st rail every time. This also meant for different squirt cues you had to aim your line differently.
The above two ensured that: "The strike point of the cueball and its path before the 1st rail were all exactly the same"
I was the only one who did the experiment, after about 50 pages or arguing. I used 4 or 5 different cues, including my predator playing cue, predator break cue (leather tip), house cue off the wall, break cue with phenolic tip. All the cues were completely different in stiffness, hit, feel, look, tip, diameter, taper, smell, etc.
They all returned the cue ball to the exactly same spot on the second rail. They all put the exact same amount of english on the cue ball.
I encourage anyone to look up that thread and see the setup and try it yourself with 10 cues and convince yourself of the results. I'm not posting the link, because if you are serious about trying it, instead of just theorizing about why one cue is perceived to spin more than another, you can do the work and look it up. The reason I say this is I don't want to be involved in another 50 page thread. ANd based on that last thread, people here just like to write, and not try at the table.
Good day.