You might find the following previous thread on the subject of interest.....

Here is a link that might be useful: Blieriana flowering plum

Well, OK then.

I like the flowering Prunus, but they all seem to have some sort of health issue.

P. subhirtella (Higan Cherry) seems the healthiest for me, overall, both upright and weeping. Yoshino does OK usually. The Newport and Thundercloud plums are OK but seem to die off suddenly around 15 years of age around here.

I've heard P. mume itself is actually "healthier" than most Prunus as well, but blooms SO early it's freeze prone here from my understanding. Also marginal in hardiness.