Is a wheel-style stretcher like Chirp better than a flat arch board?

They do different things. Wheel-style rollers (Chirp, FitBeast) provide a rolling decompression and target specific spinal segments, while flat arch boards (MINOLL, ChiFit) hold the spine in a static extension stretch. Specialist subreddit discussion suggests wheels are more versatile for active mobility work, while arch boards are easier for passive daily decompression and cost a fraction of the price.