skunks or omnis for slip over coils?

I was looking on IL4 to kill some time today,im looking some new slip over coils and Im wondering what over all would be the better coil to go with,and what are the down’s of both?

Omni’s-448lb in front and 336lb in rear
skunk’s-400lb in front and 500lb in rear
I take it the highs the LB number the stiffer the spring?