New Balance FuelCell SuperComp Trainer v3 vs Adidas Adizero Prime X 3 Strung:
Which to Choose

Both shoes deliver a soft, lively PEBA foam ride — FuelCell in the New Balance, Lightstrike Pro in the Adidas — with a full-length carbon plate that rolls you forward and snaps back once you commit to the pace, and both are honest about turning a little tippy at slow jogging speeds thanks to their tall stacks. The decisive difference is height and geometry. The Prime X 3 stacks a towering 48 mm at the heel and 35 mm at the forefoot for a steep 13 mm drop, pairing its plate with Energy Rods 2.0 for an aggressive, heel-biased rocker that wants to tip you into faster paces. The SuperComp Trainer v3 sits lower at roughly 40 mm heel and 34 mm forefoot for a moderate 6 mm drop — the forefoot cushioning is nearly identical, but the far shallower heel gives a more balanced, level platform that feels less like a chute and more like a controllable trainer. That extra foam costs the Adidas weight: it comes in around 291 g, versus roughly 261 g for the New Balance, so the SuperComp Trainer feels the more nimble of the two underfoot. Crucially, the Prime X 3's stack sits above World Athletics' legal racing limit, so it's a training-and-fast-long-run tool only; the SuperComp Trainer's lower build keeps it race-legal, meaning it can double as a workhorse trainer and a day-you-race shoe. Use cases otherwise overlap almost completely — tempo work, progressions, and long efforts in the half-to-marathon range — with the Adidas leaning slightly more toward big cushioned mileage and the New Balance toward versatility.