The 29-er is more “pedal-friendly” all-rounder, although designed to the modern standards – long front, short rear and slack angles. A smaller wheel Prone is a frame for more aggressive riders – the angles are even more slack and we recommend to use it with a longer travel fork.
But what about this
http://www.chainreactioncycles.com/mobile/octane-one-prone-27-5-frame-2018/rp-prod155476