Arabians look good on paper but they aren't the best or fastest horse. Might seem like it cuz they are small and the elite handling but there are better. I personally don't care for them because they are scared of their own shadow. And trip a lot, at least from my experience and hearing from others who have them. They are good for racing though.
My personal favorite is the Missouri Foxtrotter. 7 speed, 5 acceleration. The stamina is on par if not better than the Arabian (9/10). Health I believe is 8/10. Chill disposition and fairly brave, about as good if not better than the Turkoman which many will tell you is the best as far as combat. Mine sticks by me and will come to me even though I'm being shot at or she's being shot at (needed my hat while hiding from a sniper behind a rock and he shot her 2-3 times and she was still coming to me, saved my ass). I'm like the Terminator when it comes to assassinations because of the Foxtrotter speed and stamina, no one escapes me. I've been in fire fights and literally shooting around her and she still stays where I left her (she was standing between me and the other guy). Or I've charged people with her and she takes 2-3 direct shotgun blasts and still keeps going. Comes in two coat choices; silver dapple and amber champagne (golden brown).
Turkoman is next best in my opinion although others could argue otherwise. 6 speed, 5 acceleration, 8/10 stamina, 10/10 health. Brave, bigger like a thoroughbred. Very pretty, silver my favorite. From personal experience and what others tell me, the Turkoman likes to kinda wander off sometimes. Three coat choices of silver, gold (looks like mustard tbh), and dark bay (black/brown).
Best saddles are the panther trail and rattlesnake saddles. Panther if you prefer less stamina core drain, rattlesnake if you prefer less health core drain. But you need to be like rank 89-91? I think. Both add 2 speed/acceleration to base stats making the Foxtrotter 9 speed and 7 acceleration, turk 8 and 7.
You test the horse's "bravery" by how close you can get to a predator before it starts to panic. Both Turk and Foxtrotter can get almost right on a predator before it gets antsy.
First pic is the turk. Second is the Foxtrotter (you can see the health and stamina for that one).
There are others that have 7 speed as well: reverse dapple nokota, brindle thoroughbred, ultimate edition thoroughbred.