Back to Base Form: In his last duel against Ai, Yusaku uses Firewall Dragon Darkfluid, the monster that defeated Bohman, and Accesscode Talker and while the latter was able to tie against Ai's The Arrival Cyberse @Ignister
I like to include good cards against the deck because it gives opprotunity to think about what you mean when you say the set is broken or whatnot, when in reality it is slow starting, must-have setup deck, vulnerable to popular sidedeck cards, fairly weak monsters, and runs off a field spell
Each 2017 Mega-Tin is sold separately
In practice, that means you can often add a lot more cards to your arsenal immediately, burying your opponent in card advantage
As Zowayix said, it's a toss-up between Sword and Knowledge, but to help on the early stages, I'd say go with Sword