I have tested and used a variety of different tips for breaking, and here's my unbiased assessment of them.
These are the tips:
Moori: Soft, Medium and Hard
Talisman: Hard
Triangle
Phenolic
I used them on different cues: A Meucci, a Southwest style, and a junker I got on eBay.
If the goal is just to splatter the balls all around, the phenolic tip wins, no doubt about it. But if the break has to be powerful but controlled, trying to control where the cue ball ends up, and not just near the rack or the middle of the table but up table in the middle around the 3rd diamond, the phenolic tip is pretty much useless. To get that kind of cue ball control and placement it's necessary to hit a tad below center and when you do that with the phenolic tip, those miscues start to multiply, and the deflection/squirt monster will eat you up too.
As for jumping, the phenolic tip I have on my jump cue (homemade, by the way

) works absolutely great, and jumping is literally a breeze.
One other possibility for breaking: I got a Sneaky-pete cue on eBay, made by Excalibur. It has a really strong shaft. 19 ounces, son of a gun has one heck of a hard tip on it. It's leather, but probably was impregnated with something because it's not a hard as a phenolic tip, but it hasn't mushroomed even a tad since I got it. It breaks GREAT, and shooting low or with English works just fine, although it deflect like crazy, which is fine for curve shots and masses and so on. It plays OK for regular stuff, but definitely is not my cup of tea for normal use. Must say that on a bar box with those weighted cue balls it draws them quite nicely.
Anyway, I use the Excalibur for breaking. The Talisman hard works just fine too... Oh, and by the way, I have no problem potting a couple of balls on the snap at 9 ball using this cue. Don't have to slam the rack either...
Hope this is of help.
Flex