My personal CSS Property order is currently as follows.
content and other esoteric stuff
display
flex
flex-direction
align-items
etc.
positioning
position
top
bottom
left
right
z-index
box model
height
width
margin
padding
text styles
color
font-*
text-*
vertical-align
etc.
container styles
background-*
border-*
etc.
css3 & uncategoized
cursor
transform-*
transition-*
etc.
svg properties
fill
stroke
etc.