Ok so I have 2.5 Arabians and compete in distance riding so I'll give you my opinion.... I'm certainly no expert and hopefully
will chime in because she has ridden zillions (at least it seems!) of Endurance horses....
Chico (Lad's Switch Blade) https://www.allbreedpedigree.com/lads+switch+blade
is my almost 18 year old purebred Arabian. We bought him as a 15 year old who was kid safe/only liked to walk. On a whim (actually because we didn't have any other horses ready) we brought him to a novice distance ride (12.5 miles). Turns out he loves it! He's very fast and lives for the trail but ALWAYS has brakes/listens when you tell him to. The only time *knock on wood* anyone has fallen off of him was when he tripped and my husband went over his head.... He's Polish bred and very steady. He wants to go, don't get me wrong, but he listens. I would do anything for a clone of him.
Jake (TRJ Just Jake) https://www.allbreedpedigree.com/trj+just+jake
is my 9 year old Egyptian Arabian. He was a halter horse in his younger days and came to us very spooky and used to life in a small paddock and indoor arena riding. We've had him a year and a half and he's done one novice distance ride and will hopefully be finishing his first 25 mile Limited Distance ride in the next month or so. It has taken him this long to get used to uncontrolled situations. He can get a little hot but is quickly learning that he can't do whatever he wants. He is very smart and a fast learner.
Lilo is my 1/2 Arab 1/2 Paint. She's only 4 and is just going to the trainer this weekend for under saddle training but I can't wait until she's ready to start competing. We bought her a year ago as a basically wild untouched not even halter broke filly. She has been the calmest/fastest learning horse I've ever met. The only time to my knowledge she had ever been in a trailer was when we brought her to our farm last year and it took 4 people and closing her in with cattle panels to get her shoved in the trailer. Last night I decided I better start working on trailer training so she can go to the trainer so I walked her up to the trailer and she jumped right in. She has been exposed to tractors/4 wheelers/cars/trucks/chickens/dogs/ducks/deer/etc and takes everything in stride. The first time she had ever had a saddle on she acted like it was an every day occurrence.
I rode my APHA mare almost 300 miles in Limited Distance rides (and would still be riding her this year except she seems to have tweaked something in her back so I'm letting her heal). She has great recoveries and is as steady as they come but she doesn't have the speed that my other horses have. However she has more heart and loves competing more than anything. She never gets hot, never races, never wants to chase down the horse in front of her..... Just wants to do her job and finish.
My DH just finished his first 25 mile ride on his Rocky Mountain Horse. Comet was fantastic and even pulsed in faster than Chico at the finish. We finished in the top 3rd of riders that day and they didn't seem tired at all. Comet is a little hot and spooky still but I'm sure after a few more miles he will get over that pretty quickly.
Finally, I do most rides with my good friend and her 6 year old TWH. Major is a fantastic competitor but does get a little hot as well.
Anyway, long story short try out a bunch of horses and see what you think! Even between Arabian's their personalities are very different.
Also, I agree with
we need more information on your goals. I only aim to finish, currently we are at 25 mile distances but I'm *fingers crossed* hoping to do a 50 at our next ride. Wanting to finish vs. wanting to win can make a big difference as well.
Obviously you need some pictures of my kids (HAHAHA):
Chico (Bay Arab in Green)
Jake (Chestnut Arab in purple)
Comet (Chocolate Rocky in Blue/Green)
Stitch (Solid Chestnut Paint in Pink)
Lilo (White/Chestnut Paint looking half arab)