I grow montmorency, juliet, and carmine jewell on their own roots. @39thparallel gifted me an early richmond on its own roots. I prefer cherries on their own roots and have far better luck with them that way. I have plenty of mahaleb rootstocks and a north star, but the results are not the best. Growing sweet cherries is possible, but the results are disappointing at best. I grow mahaleb on mounds.
Carmine jewell
Montmorency
Grafting sweet cherries