For insulation ability I haven't been able to beat the cheap styrofoam cooler we bought for a picnic 27 years ago. But it's taken some TLC to get it this far. (the lid finally got abused and stressed enough to crack on the last trip)
Softside cooler doesn't hardly seem to provide much more than shade. Hard sided Coleman seems to be in between.
Will probably splurge and buy another styrofoam one. :-)
i used to travel on business a fair amount. One of the first things I usually did was go to Walmart or KMart and get a foam cooler and a case of pop. Never liked the $1.50 or $2 cans of pop at the hotels.
It never bothered me to leave the cooler and the left over pop when I left town.
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob