Here is one opinion from Jim Lamastus. It is an 8 ball break. There are many theories about the subject and I'm sure you will hear from others. In the long haul you will have to determine what suits you as a player.
A better 8 Ball Break, by Jim Lamastus
Date: Wed, Dec 15
Topic: "The Break Shot"
In response to your better break shot article I have found that different tables play differently, I usually watch how others are breaking the rack. and measuring there success, but I will always try breaking from the far left or right of the 2 diamond spot using 2 to 3 fingers distance off from the rail To place the Q-ball.
If breaking from the right I use low right about 5 o’clock 1 and 1/2 tips down from and right of center cue ball English hitting the 2nd ball from the head ball just missing the head ball as my aim spot.
You may need to adjust the position of your cue tip hit on the q-ball to match your shooting style and the type of Q tip you are using- multi layered tips for example hold english a little better than a single layer tip - low right from right side of table or low left from left side of table is still the best location of Q-tip to Q-ball hit for your break.
From the left side of the table I use low left English as stated above.
Study the rack you will see that the rack will not be set up square to the table - meaning that the rack will be slightly slanted in one direction or other this provides more of an exposed side showing over the other witch in turn shows more exposure of surface of the 2nd ball in the rack. That is the side you want to use to make your break shot.
Bottom line is the bigger Q-ball entry to rack angle as compared to your example also shorter exit angle to rail from rack break that in turn drives the q-bqll back into the expanding rack that helps expand the break.
Try the break shot to rack at the most exposed ball that is second in the rack.
Break speed of cue should be strong hard but not as hard as a Q ball head on break shot. Break speed is the key to this break style and should provide a least one pocketed ball on break a little practice and you will be happy to add this style to your arsenal.
Enjoy and i hope this will help your game.