If you have never had any Microsoft console, I advise you to take version X instead of S. The series supports backward disk compatibility with all past generations, you can easily find disks on ebay all over the country. If you already have old set-top boxes, then it's better to take S-ku, which costs 2 times cheaper, but without a drive. The only difference there is that S does not produce 4k and a smaller hard drive. Versions of games for 360 and Xone can be written to a flash drive / hdd with a memory capacity of 120 GB or more (a 128 flash drive will not work, there will be less), and play from them.