Personally, I do not see any merit to having a break cue weigh the same approximate weight as your playing cue.
Now I concede there’s debate about mass (weight) vs. velocity (speed) among players. Is a heavier cue better than
a lighter cue? The obvious suggestion being you can swing a lighter cue faster than a heavier cue. Baseball is proof or
example. But it is also true that a heavier mass, i.e., weight, swung at the same speed as the lighter mass (bat), striking
the object (ball) delivers more energy to the object struck. So I think the best approach is to select a break cue weight
enabling you to strike the cue ball as hard as you want without sacrificing accuracy. And by accuracy I mean exactly where you intended to strike the cue ball, without “any” unintended side spin and the contact point on the rack. As you
experiment you’ll discover cue weight has a big influence…..wanna see….try it with a 25 oz. cue and a 19 oz. cue…..
swing as hard as you can and then start dialing it back…..there’s a sweet spot you have to find for yourself.
Anyway, back to my point. Since I never swing my playing cue as hard as I do on a break, why would I want a break
cue to be the same weight as a cue I never swing that hard with? Don’t I just want a cue weight that works the best?
IMO, this suggests it’s trial and error for 2 reasons: people are anatomically different and one’s break shot approach.
p.s. Forgot to mention breaking with your playing cue just means you’ll have more tip shape maintenance to perform.