I go barefoot, but if you want good slippers, I always recommend that you see what older people are wearing. Due to their higher fall risk, they need to have good footwear. Consequently you know that whatever they choose, it will be comfortable and good quality.
PSA: if you have diabetes or other conditions that result in poor circulation, foot care is vitally important. Don't soak your feet, don't go barefoot or wear mended socks, don't remove dead skin by yourself. Ensure your skin doesn't get too dry. Be VERY careful when cutting your toenails - file them, don't cut. Consider having a professional do your foot care. Diabetics and others who have circulation problems can develop wounds to their feet, and they often won't heal properly.