Powerbomb is you want more power in the mid-top range. Megabomb if you want more low-mid. Neither one is better. I personally prefer the Powerbomb as it suits my style better. (Personal Experience)
@THATMADIRAQI Hey bro, if you're looking for jobs from these companies... you won't get any response through RU-vid... CALL the company and talk to someone directly. Don't email... trust me... you won't get a response, and if you do... it'll take a long time to get one.