The biggest benefit is JP Boost, which dramatically cuts grinding and allows for even further tweaking
Flashback: The first chapter is a flashback (the tutorial battle at the beginning of the game takes place at least a year after those events, and chapter 2, taking place in the "present," takes place mere moments after Princess Ovelia is abducted)
This will affect how smooth a card feels in a given direction
Flinging a large Dragon pressures life totals while fueling follow-up plays, keeping momentum even after board wipes
But no one could be expected to be playing with the Power Nine originals. Some people buy from Chinese vendors to fill out a proxy deck to play in a local tournament
One place that you can find Crown Zenith is on eBay, and one of the best products for value you can purchase is the Crown Zenith Elite Trainer Box