If you're going to bring harddrive space into the equation, you should probably point out that XBox One and PS4 games have mandatory installs often in the 30GB plus range. Wii U games have installs of 0GB. About 408 GB on a PS4 is usable, which can mean as little as 10-15 games may be installed at a time.
Obviously I'm not ignorant to the advantages of having a larger harddrive, but a straight 1:1 comparison of hardware sizes as a price justification isn't appropriate.







