IMO you should go with what you think will satisfy you. Sometimes it's a recreation, sometimes it's a commission. If you have an artist (or inker) that is still alive that has done one of your all time favorite covers that you know you will never get, either due to price, that it's nowhere to be found, or the seller will never sell, then why not consider a recreation if that's what you really want? A commission might be cool, but it may not fit the bill for what it is that you are really looking for.