Upgrade speed and weight, and you have the perfect travel / gathering mount.

Upgrade health and attack, and you have a hadrosaur warlord. (I’ve taken down rexes with my lvl 127 combat iguanodon, trust me, iguanodons make better combat mounts than you probably think)

I use my speed/weight iguanodon for quick metal runs, and use my health/attack iguanodon for doing things in dangerous places like the swamps. Kapros can still knock you off of iguanodons but they move so quickly that it’s not much of an issue.