You’ll benefit greatly by taking time to see what there personality is like and observing other things about them like their habits.
When you take the time to get to know and understand your horse you will find out such things as… is the horse sensitive, spooky, fearful, pushy are they easy to catch or not.
See if you can touch them all over or are there places that they will no let you touch?
If you have another horse observe their reaction with each other for a few days this can tell you a lot about them. For instance one of my mares will turn and kick after smelling a new horse so you would want to be aware of this as it may be something they try when you start working with them. More