Comparison to Harrison Onyx 7700 and Amber 6700

Hello
I wish to purchase a King Size mattress and divan for myself and 3 double mattresses and divans for my children (aged 8, 9 & 11). I'm 5'8" and weigh 10.5 stone so am working to a medium tension. I've tried the Harrison ONYX 7700 in stores for myself along with AMBER 6700 for my children. Would Artisan Naturals and Origins Pocket 1500 be good "equivalents" in your range?
Many thanks
Mr Atwal