Choose HIMARI or SORA when the published dimensions fit your room and you can regularly lift, air and keep the bedding dry. Compare the firmer HIMARI with the fuller SORA by personal preference, storage space and the actual local offering. Thickness alone does not determine comfort.
Details to check before choosing
Measure the usable length and width of the floor, platform or bed base, including any raised edges. Compare those measurements with the exact model and size offered for your country. Then check the folded size and weight, and choose a sheet or cover that fits the same dimensions.
After sleep, lift or stand the shikibuton so you can inspect its underside and the supporting surface. Let both release moisture. Air both faces in a ventilated place, turn the bedding over and rotate it head to foot regularly. Fold and store it only when it is dry.
Sources for this answer
Does low sleeping fit the way I use the room?
If a room in your Skopje flat is shared with daytime household activities, consider where the bedding will stand while airing. Would that position block the route through the room? Measure the sleeping footprint, handling space and dry storage separately. Folding helps only when there is a workable place for each stage, including the time after getting up when the futon is still being aired.
HIMARI is 210 cm long and approximately 10 cm thick overall; SORA is 200 cm long and approximately 12 cm thick. Compare firmer support with fuller cushioning as personal preferences, rather than treating thickness as a comfort score. Check the chosen size's weight and your ability to handle it. A preference for a high bed or very soft mattress deserves discussion before buying floor bedding.
How do I choose between HIMARI 日葵 and SORA 宙? · How do Japanese shikibuton sizes compare with local bed sizes?