the stone lord mount is the best mount in game hands down.. you summon a small earth elemental which is like the paladin mount which is like the druid animal companion.
This mount
functions as a druid’s animal companion, using the
paladin’s level as her effective druid level. Bonded
mounts have an Intelligence of at least 6.
Once per day, as a full-round action, a paladin may
magically call her mount to her side. This ability is
the equivalent of a spell of a level equal to one-third
the paladin’s level. The mount immediately appears
adjacent to the paladin. A paladin can use this ability
once per day at 5th level, and one additional time per day
for every 4 levels thereafter, for a total of four times per
day at 17th level.
At 11th level, the mount gains the celestial template (see
the Pathfinder RPG Bestiary) and becomes a magical beast
for the purposes of determining which spells affect it. At
15th level, a paladin’s mount gains spell resistance equal to
the paladin’s level + 11.
Should the paladin’s mount die, the paladin may not
summon another mount for 30 days or until she gains
a paladin level, whichever comes first. During this 30-
day period, the paladin takes a –1 penalty on attack and
weapon damage rolls.
the differnce is that the stone lord starts with the celestial template and changes size as the stone lord levels
