The Hustle Castle best weapons and armor are going to be of legendary quality though some item types like artifacts don’t go up to legendary. Legendary items can be found in arena chest along with purchased in the portal store. You can also craft them using purple shards, but it might take a while to save up the amount needed. When you equipped items with better quality you will dramatically increase your squad power. Weapons and armor can have certain buffs that come along with them that will set them above the rest.
You have to remember that your gonna need at least 6 five start potential dwellers if you want to wear the best gear. This can be done by making them in the Living Room or by upgrading the ones you have using diamonds.
I would have to say that the best weapon in Hustle Castle would have to be a mage weapon with resurrection on it. When you have more than one you can keep raising dead teammates at a good enough rate to stay afloat well over you squad power limits. You should get one resurrection wand early on automatically while you’ll be on your own when it comes to finding more of them.
The best armor will depend on your class since they offer class specific bonuses. You can put armor from other classes on any class but it will lower your squad power rating by a large amount since your missing out on the damage and defense bonuses.
If I had to choose a winner I would go with melee fighter armor as they hold the front line like tanks so the more damaging back rows can deal their damage.
The best spell seems to be Lion’s Spirit as it increases attack damage by a large amount and will raise the damage of other spells when used before.