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. :-)