I forgot to mention you won't need the extra storage for quite sometime unless you plan on buying 20+ games right away. And in that time you don't need one keep an eye out for a sale external hard drives are always having crazy sales and that's the time
to grab one
Yeah, I picked up a 500gb and then went with an external for one of my sons. Basically, I was able to get more storage for the same money. And he can take that storage device with him to a different console and play his games that are installed. No re-installing
of games at the new destination.
I would just look at which console gives the best deal. If I was getting a 1tb with extra games over the 500gb then maybe. If the games are the same I would do as above.