I have a pittosporum here and an euonymus. Not sure which variety though. I've never used either one in the landscape and i have room for only one. Which one is more drought tolerant, heat tolerant and cold hardy?
In terms of cold, the Euonymus japonicus is hardier; in regard to heat, all I can tell you is that Pittosporum tenuifolium grows well in USDA zones 9-11, and the Euonymus in USDA zones 6-9.
The other thing to take into account is the eventual overall size - Pittosporum tenuifolium can get up to 30 feet, whereas Euonymus fortunei typically reaches between 10 and 13 feet.