Which is better for "Twice a year" couch co-op? A new file or an existing save?

[QiamOnline]

Context, I'm going to my grandparents house, and I want to play Rotwood with my cousins. I really want this session to be fun because I rarely get this opportunity to meet them. If I used my solo save file, only some gear are fully upgraded, so we might just use those and "follow the meta". A new save file might have the joy of discovery, but I think it might be too grindy for a game I can only play twice a year with them.

[molivious]

an existing save that has all the stuff (armor & weapons even if not fully upgraded) should be a decent idea. In your files, you can just duplicate one character and reuse them for the rest of your other character slots (naming them 'character_1', 'character_2', 'character_3', 'character_4' accordingly). You can then just let your cousins use the dresser to customize their characters and jump immediately into the game with everything unlocked.