We sold our horses recently, It was a VERY tough decision for us as like most horse owners they had become part of the family. What we boiled our decision down to was "What's best for the horses".
We decided that finding a good home for them would be better than leasing and worrying about them 24/7.
We screened several prospective buyers and worked out financial details with the ones that we felt would be the best owners, not the ones with the deepest pockets. (they had money to care for the horses but were only expecting to buy one and fell in love with both our horses, so we ended up trading out part of the purchase price. Basically we got money and a really nice hunting rifle.)
We drive by the horses about once a month and check on them. They are happy and healthy looking.
We also wrote in a clause of "first buy back option" should they ever want to get rid of the horses for ANY reason. That gave me piece of mind. Also the new owners knew they weren't stuck with a horse they didn't get along with....Which made it easier to carry on an open and fully disclosed conversation about the horses and the new owners.
I thought I'd share my situation with you, though you are the only one that knows whats right for you so I won't push one way or the other.
Good Luck with whatever you decide!!! It's not easy to say goodbye either way!!! (((Hugs)))