90% of an effective break, IMO, is a tight rack, a direct center hit on your object ball in the rack, your break cue speed, and proper timing/technique of the break cue stroke to the CB.
If you have ALL of that perfected, the break cue that is most comfortable for you will add the final 10% to your break. Experiment - yes- I have experience with the Li'l Monster break/jump, the BK Rush, and the BK3 shaft on a sport wrapped plain maple cue butt.
For me, I like the BK3 first, and I saw no difference between BK Rush at $800 new and Lil Monster at about $125 used. I like a hard leather tip on my break cue, I found the cue ball difficult to control with anything but that on the end of my break shaft, although the Kamui control break tip and the White Diamond break tip rank high in my liking as well.. Just my 2 cents.