Hi Jgo,
I don’t know the specific details of either mattress you are looking at so I can’t make any specific comments but 1.8 lb polyfoam and latex are both good quality durable materials (latex even more than polyfoam) and a two sided mattress would be more durable than a one sided mattress as well (see post #3 here) but I do think highly of Holders in Lafayette and I think it would be well worth the drive to pay them a visit.
Phoenix