Depends a bit but often enterprise drives come with a different warranty/service agreement to consumer drives and in some cases use uprated components to provide significantly increased MTBFs.
Depending on requirements you may find they are significantly better workload optimised as well - while maybe not having the raw speeds of a high end consumer drive a lot higher IOPs for instance.
EDIT: Many years ago I tried using normal consumer HDDs in a server that was parsing and logging significant amounts of data in realtime (probably the equivalent of a few days worth of posts on these forums every hour) and after a few weeks they'd fail - with one literally almost melting
quite dramatic heat failure under constant load - replaced with an enterprise level drive it ran happily for years.