Seriously...anyone who gets a Xbox One at launch with its tiny irreplaceable 500GB is getting ripped off bad. The console will be useless in 12 months max.
Get this: Killzone Shadowfall has a mandatory 42 GB install. Ryse has a 45 GB install. Forza and the Walking Dead has a 35 GB install.
Keep in mind these are launch games. LAUNCH games. Not even 1st generation titles like iNfamous Second Son which will likely have a larger install.
500 GBs will be gone in no time - and you have no way to upgrade the HDD unlike the PS4.
but, but but but, I only buy DIsc games! Doesnt matter. These installs are huge and required. Also all those free games on PS+ and Xbox live? You HAVE to download those. 50 GBs a pop too.
500 GBs now is as good as 20GBs in 2006...Good thing I'll be upgrading my PS4 HDD to 2TB ASAP.
Meanwhile the only choice of upgrade for Xbox One launch consoles will be...a new console. Of course Microsoft probably doesnt expect their console to last more then 2 years, so you'll be buying a new one anyway.
Final Verdict? PS4 is the only next gen option until Microsoft releases at minimum a 1TB system.