RV.
Having own bathroom while en route is more convenient & safer than public options. Others w/you free to move around instead of being cooped up for 6hrs
Privacy better at end destination
Food / drink with you
It’s good you have viable option either way, but the RV gives you more options & definitely more comfort going to/fro.
ETA: The putting 'extra miles' on it way of thinking is flawed, & I know because once upon a time I was like that. Think of it like this: Who are you saving the miles on it for, the next guy that owns it? :D You bought it to use. Your RV should be serving you, not you serving your RV. Make sense?