Both of these have their own pros and cons
Ready-to-play 51-card deck
This is a set of nine cards that originated in the very earliest days of the game within the Alpha, Beta, and Unlimited sets
If youve played against them once, youve played against them all because the small differences in iteration between anyones list for these decks can be so minute youd feel like youre playing against a stock list
But if you change this with something like Opalescence (or are using the Faceless One), then your background commander would be affected and could be targeted by anything that says commander creature. Most of the cards that refer to commander creatures instead of just commanders are background cards themselves
Even if the curser doesnt then wipe all the now measly minions from the cursees board, it becomes so much easier for anyone else at the table to destroy them, not to mention just attacking