Artisan Naturals compared to Harrison Onyx 7700

Hi, I am interested in the Artisan Naturals mattress, superking size. We tried out a Harrison Onyx 7700, mainly because I knew they do it in a split tension but that's not such an issue now as I think we may need zip & link to get it up the stairs. We were happy enough with the Harrison although I thought it felt a little unyielding. I am 5' 5" and 10.5 stones and my partner is 6" and 15 stone. I suited the Harrison in a medium tension whereas my partner needed the firm to support his weight properly. Given this and the advice on your website, would you still recommend that a medium tension Artisan Naturals mattress would support us both? Are you also able to comment on how the Artisan Naturals would feel in comparison to the Harrison Onyx?