Earlier quoted context omitted.
Better for some uses... one of the major use cases for the mini is for media storage or file sharing, in which case I'd gladly trade speed for space.
then why 5400k? At work (90% mac shop) we are just looking at what to do for a central server. Apple isn't supporting that market very well - they need a shuttle sff size mac midi that uses full fat non mobile parts. The gen 8 HP micro severs are just so much better
Apple has tried to support that market before, and it's just not a big market, and it isn't a one-size fits all market. Many people have been clamoring for an Apple solution for SMB server, and it just isn't profitable. This is especially true when you take into account cloud shared storage providers like Dropbox or Box.net.
It's also a market that is more focused on margins. It's easier to charge a higher margin for a device you use everyday, but what about one that you install in a closet or put in a corner and forget?
An HP microserver running FreeNAS is a tough combination to beat for an SMB central server.