For me, both the Fuel and Rail feel almost identical when I sit on them. The geometry, seat, pedals, grips, bar and tires (2.5” and 2.6”, Assigia), are all exactly the same. The noticeable difference is the weight.
The Rail is a Tank, more pedal power, awesome on long climb's and will crash over anything.
The Fuel EXE is good on climbs but is awesome on technical descents. It’s fast and agile.
For long straight docents…they’re the same. On days where I’m packing tools or riding to a higher trails, I use the Rail.
When I want to play around or get more of a cardio workout, I use the Fuel.
If I had to choose one…it would probably be the Rail …but I really like the Fuel.
Man…that sounds wishy-washy.