Depends on how high you wanna go in cross country. But pretty much any horse that has the physical ability to jump I think has potential. I look atbreed too but I also just look at how they are built and all.
You could find a nice let’s say quarter horse and a crappy warmblood. So idk The whole breed thing is just eh. Idc what breed my horse is as long as he or she can do it. So yeah!
But I will say majority of the time warmbloods are known for being the nicer ones for jumping.