I have aureomarginatum and in my opinion, it's a dud.
Variegation is not very distinct.
And the tree gets so big so quickly (mine's over 15yrs old & 30+ ft tall, maybe taller),
so you can't notice any of the variegation way up there...
Not spectacular enough for all the room it occupies, in my opinion.
I've grown 'Snowbird' in field-testing, but have never been happy with the plant's vitality or vigor. The color in the variegation is fine during the spring (new growth) and then seems to fade with heat with sun...I did not rate it well in the field-testing and wouldn't use it in the Southern Garden...good luck!