Well for me no miniature stallion could ever replace Coyote Winds Knockout. He is my pick without hesitation. I am so glad I have a daughter of his. He only produced 3 offspring in his short life, a AMHR colt that I sold, a grade filly owned by a friend and a AMHR filly that I own. He died at age 4. I bought him as a yearling. For a stallion who is still alive and well would have to be Oneka's Devil After Dark, my new boy.
For an arabian(since I also breed arabians) I would have to pick Magnum Psyche for a stallion who is still alive and for one that is no longer with us it would be the legendary *Bask. Though I do have my eye on a Magic Dream great grandson I'd love to add to my herd. He is a coming 2 year old stallion and very typey with excellent polish lines(*El Paso, Probat, *Gondolier).