Asics Gel-Cumulus 27 vs Mizuno Wave Sky 8:
Which to Choose

Start with how alike these two are: both carry high (but not maximal) cushioning, both run on an 8mm drop with no carbon or composite plate, and their stack heights are almost identical — roughly 41mm at the heel on each, so neither sits noticeably taller than the other. Weight is a near wash too, with the Cumulus 27 at about 265g and the Wave Sky 8 at about 271g in men's sizes; you'll feel that handful of grams far less than you'll feel the difference in ride. That ride is where they split. The Cumulus pairs FF Blast+ ECO foam with Asics' PureGEL heel unit for a soft, calm, rounded landing — transitions roll along smoothly at conversational pace but feel flat and slow to rebound the moment you try to push. The Wave Sky counters with a dual-layer Enerzy midsole that delivers a springier, more energetic toe-off; it's the livelier of the two through the stride, though its tall, soft platform can feel a touch floaty and vague when you lean on the pace. Stability is the other real divide: the Cumulus is a straight neutral shoe with a broad, planted base, while the Wave Sky's wide, sidewalled platform makes it stable-neutral — no medial post, but more inherent guidance that suits neutral-to-mild-overpronating runners. Finally, range: the Cumulus has enough protection to carry a relaxed marathon, whereas the Wave Sky is happiest topping out at the half, with that distance its sweet spot.