I personally would like to see a difference in the types of mounts.
Some that go fast on land, others that go a little slower but you can sprint, others that go a little slower but hold a lot and it is difficult to dismount, others that go slow on land but fast in the water, the same for the air. ..
In addition, I have always thought that large flying mounts or dragons in games like wow should go slower on the ground but faster in the air than pegasus mounts.
That's why I think it would be cool if there are smaller, more agile mounts that reach their top speed sooner and larger mounts that are slower at first but win on longer rides.