(my 4 speeders only got one more positive trait and NO negative ones)
3s for piebald
4s for ebony black (this color adds a bonus to movement speed = faster than all others = pretty much 5 speed traits)
My only one advice is that you get them branded ASAP, for two reasons:
- Branding has the side benefit of allowing you to equip gear WITHOUT having to ever tame them.
- The only real downside to hell horses is that some will, despite being bred and named, get aggro from spirit templars unless branded. If you do have active templars, you want them branded. If just passing through someone elses deed, templars are much too slow to catch them.