If I absolutely had to pick just one...probably the hoya from my grandmother and her grandmother and hers...
I didn't know there was a mini Murraya--
mine just came in from summer vacation and bloomed up a heavenly storm
It's about a 3x2' shrub and I've had it about 20 yrs...maybe it's a mini or it is stunted by its pot and my lack of care
It usually gets two flushes of bloom in the spring before the heat hits and then one in the fall, then blooms sporadically over the winter. Cool nights is supposedly what helps it bloom.
Wonderfully fragrant! And a pretty darn resilient plant, too; good choice