Money order?
Just wait till someone tries to claim you never paid them. Then try to prove it.
Checks are better for that reason.
For twenty years I have never had a problem because I save the receipts. What’s so hard about that?
I also don’t have to balance a checkbook or worry someone is going to use my checks or wonder where they are.
Remember, I only use the money orders for things I can’t use a debit card for the very rare opportunities to buy something I can’t buy locally.
For purchase over five hundred dollars, I use a bank certified check.