250gb is better, in my opinion.
Larger ssd drives are a bit faster because they have more nand chips that can be accessed in parallel.
The extra nand will also result in better updates because it is easier to find an empty nand block.
The main advantage of a PRO is endurance. Likely a useful life of 15 years vs. 10. It is a moot point, both will be obsolete before they wear out.