Adizero Adios Pro 5 vs Cielo X1 2

£220 is a lot for a pair of running shoes, but it's £30 under the Adios Pro 4's £249.99 RRP, and on paper you get more for it. adidas has swapped the old EnergyRods for an ENERGYRIM carbon ring taken from the Adios Pro Evo 3, packed more Lightstrike Pro foam directly under your foot, and brought the listed weight down to 177g. The early reviews are strong. Doctors of Running and RTINGS both rate it best for half and full marathon racing, with a softer, bouncier ride than the Pro 4 and a heel that no longer slips. It's less convincing at 10k pace, where some testers found the soft forefoot a touch less snappy, and it was never meant for easy miles. If you race 13.1 or 26.2 and can hold your form late on, this is one of the first carbon racing shoes we'd shortlist, next to the Vaporfly 4.

The Hoka Cielo X1 2 is the brand's flagship carbon racing shoe, and it does racing in a way that is unmistakably Hoka: big, plush and stable rather than razor-light. It is a road racer built around a winged carbon plate and a deep, soft midsole, so you get a tall, protective ride that holds up when your legs start to fatigue late in a marathon. At 228g it is one of the heavier super shoes on the market, noticeably more than something like the Nike Vaporfly 4, and at £275 it sits right at the top of the price ladder. What you are buying is comfort and stability at speed, not the snappiest, lightest tool in the category. We rate it as a long-distance racer for runners who want a carbon shoe that feels planted and forgiving underfoot, and who will happily trade a few grams for that security over 26.2 miles.