My campaign and adventure, my rules. Feats, splat books (no UA) and MCing is allowed, and each PC gets one very rare and one uncommon magic item.
I dare say most tables are using those options from the books.
Its a test of the upper limits of mid - high level play. I was sketchy on allowing one very rare magic item each. Seeing as the items can be cherry picked, I propose 1 rare item and 1 uncommon instead.
Once I get the characters designed, you pick the magic items. Imagine something you might have included for each player. That's how it normally works in 5E (one of the things I like). DM usually designs and inserts the magic items. So go ahead and pick what you might have given each class. Figure the paladin will use some kind of melee weapon, probably a sword.