Yeah - Sohei (Monk), Divine Hound (Hunter) and Urban Hunter (Hunter) are the strongest mount classes - take a look at those.
With Sohei you want to go (at least) 11 levels into that class.
With either Hunter, 12 levels. Though 16H/4 Mutation Warrior is strong
After that their attacks are usually bolstered further by 4 levels of Fighter - Mutation Warrior (to qualify for Mythic Weapon Speciliazation of choice, get strength mutagen and some bonus fighter feats)
And after that there is a lot of debate and preference what the last 5 levels should be - a 1 level dip into Bloodrager Beastrider gets you rage and bloodline (celestial is great)
4 levels of Sacred Huntsman is pretty good too.
or 3 levels of of Divine Guardian (Paladin) also works well.
2 levels in Cavelier can also be beneficial if there are some levels to spare.
But when in doubt as pointed above you can’t go wrong with a basic 16/4 split - with the 4 being mutation warrior.