Hoka Skyward X vs On Cloudspark:
Which to Choose

The clearest split is stack and distance. The Skyward X sits on a towering 48/43mm dual-density PEBA platform and leans on a winged carbon plate, so it feels tall, plush, and guided — it rewards a steady, lengthening stride and comes into its own over the half and the full marathon. The Cloudspark is far more modest underfoot at 34/26mm with On's firmer Helion foam and a composite Speedboard plate; it feels lively and snappy rather than cushioned, and it's happiest from 5K to 10K at genuinely fast paces. Weight follows the same logic: the Skyward X is a substantial shoe at roughly 320g in a men's US 9, while the Cloudspark is lighter at about 281g (9.9 oz), which is a meaningful difference when you're turning the legs over quickly. Drop differs too — 5mm on the Hoka keeps you balanced over that big platform, versus 8mm on the On, a slightly more traditional feel that suits forefoot and midfoot strikers pushing the pace. On cushioning they're not close: the Hoka is maximal and forgiving for high mileage, the On deliberately medium and better kept to shorter, sharper efforts. Stability is comparable in intent — both are neutral — but the Skyward X leans on a very wide base to steady its height, while the Cloudspark is a narrower, lighter speed platform. In short, these aren't two takes on the same shoe; they're near-opposite tools, and the real question is long-and-cushioned versus short-and-fast.