What to use: Repeater or Key-value

I have checked the docs of both repeater and key-value form builder fields. I liked both. I am confused about, what are the differences and why to prefer one on other. Case study: I have to get input for specifications, https://www.leons.ca/products/kelleher-sofa-silver-grey check this and go to specifications on the right side (scroll a bit). I will appreciate suggestions/brief. Many Thanks

Leon's

Kelleher Sofa - Silver Grey

Stacked Deck. The Kelleher silver grey sofa has style and comfort in the cards with its plush cushioning and fabric as well as designer stitching. Channel-tufted back cushions, pillowtop arms and a stacked base supporting comfy seats outfit the Kelleher Silver Grey with aces all around. Tone-on-tone baseball stitching along with welted trim offe...