Never sacrifice accuracy for power.
Watch the players that have the body type and mechanics that are similar to yours. Interpreted - if you're built like Marcus Chamat, Francisco Bustamante, or Jose Parica, don't try to emulate Buddy Hall or Shannon Daulton.
Being a big man doesn't always mean you need a big break. Buddy Hall has never really crushed the balls. Buddy hits them firm, but he never lets go of whitey. He's a big man, but watch how PURE he hits the balls - it's one of the most beautiful strokes you will ever see.
Buddy Hall - Side Rail Break
Buddy Hall - Slam Break
Buddy Hall - Breaking from the box
Tony Ellin did more than crush the balls, he killed them. Tony had the gift of pin point accuracy with his break - and I believe that gift is given to one in every one million pool players.
Some of the most effective and powerful breaks come from the smaller players. I bring up Bustamante, who may weigh 125 pounds after dinner and dessert.
Francisco gets his power from his mechanics (watch his back leg) and his follow through (watch how far he follows through). I can guarantee you that before he added power, he worked on his accuracy first.
Bustamante Break - DCC 2007
Bustamante Break - Alternate Angle - DCC 2007
In contrast, look at the mechanics and the accuracy of Ralf Souquet's break in this instructional video (using the X-Breaker - Just for the record, Ralf is now using a Samsara jump/break cue)
Ralf Souquet- X-Breaker break shot instruction
Here is a short video of Johnny Archer giving Fast Mikie a lesson on the 9 ball break. Johnny is very tall, with long arms and that enables him to exaggerate his follow through. I like the points that Johnny makes in this video.
Johnny Archer Break Lesson
I learned a lot by watching this guy too -
Mike Sigel Break 1
Mike Sigel Break part 2
I hope these videos help you find out what is best for you.