[sdispater]

Mainly, its API which tries to be as close as possible as the one provided by the standard datetime library while providing a bunch of helpful methods.

Also, Pendulum is not just about datetimes but also provides both the Interval class and Period class which are improvements over the native timedelta class.

And finally, it handles properly time shifting around DST transition times and normalization of datetimes when creating them which neither Delorean nor Arrow do well.