Here, anecdotally, is my effort to narrow the variables and test this.
I took two identical $100 production cues --can't remember the brand. On one I put softest tip I had (Kamui super soft) and on the other a hard tip--tinkier sound. I shaped them the same, and a player couldn't tell which cue he had on each shot until hearing the sound.
I then set up a slightly off angle backcut along longrail into corner pocket of 6X12 snooker table. Objective was to make shot and have cueball hit opposite long rail as far back as possible.
I then had a good player (725 or so rating) try about 30 times for maximum draw. Each time I handed him a cue randomly switching between the soft and hard-tip cues.
There was no difference of note. My conclusion is while people can argue all they want for reasons there might be a difference--and certainly there CAN be, any difference is at best small. I'd advise against changing from a hardness whose feedback you otherwise like in an effort to get more spin.