When in doubt, geld! I have gelded nice boys simply because their attitude sucked as an intact male, because I had enough nice stallions, or they weren't what I wanted, and now... Being out of minis and my Gypsy vanner colt getting to be that age, he wil be gelded simply because I don't want a stallion.
Only two regrets, and they are not mine, but more so for the mouths they came/come out of.....a very nice pinto colt gelded at about 9 months and someone at a show said "oh, he's so nice, he's for sale? Too bad you gelded him." he is in an awesome home with a youth that is working with a trainer to show him,and my neighbor and friend that constantly says " are you sure you don't want to breed him just once before you geld him?" when referring to my gypsy colt. IDK if she is hinting or just putting it out there, my answer is the same regardless, nope, been there done that, bought the tshirt when it came to the minis, I am done done done.
There are many beautiful boys with great comformation that do have great attitudes and excel in many disciplines, they are the stallion prospects.