Adidas Adistar 4 vs Saucony Guide 19:
Which to Choose

On paper these two are near-twins: both carry a 6mm drop, no plate, high cushioning, medium responsiveness, and post-free stability, and both have an identical comfortable pace window of about 5:30–6:30 min/km with a top effective zone around 5:15–5:45 before the ride goes leaden. The differences are in the details. The Adistar 4 sits taller — roughly 40mm of stack at the heel versus the Guide 19's measured 37mm heel / 31mm forefoot — and uses a dual-density midsole (firmer Repetitor+ under softer Dreamstrike+), which gives it a deeper, more max-cushioned feel while the two densities keep that tall foam from feeling tippy. The Guide 19 runs a single softer PWRRUN EVA-blend, so it's a touch lower and more uniformly plush, with its stability coming from CenterPath geometry — a wide base and tall sidewalls that cradle the foot. On weight, the Adistar is actually the lighter of the two at about 275g against the Guide's 298g, though both are undeniably substantial shoes that reward settling into a rhythm rather than pushing the pace. The support character diverges slightly too: the Adistar is tuned as stable-neutral, guidance for a neutral-to-mild runner, whereas the Guide leans a hair more toward dedicated stability and is the more natural pick if you mildly overpronate. Finally, range: both cover half and full marathon comfortably, but the Guide 19 also lists the 10K as a home distance, making it marginally the more versatile of the two at shorter steady efforts.