I live in Thailand and own TREK mamba 29er, which I have upgraded with a complete Shimano XT drive train, DT SWISS 1600 Spline wheels and a DT SWISS XMM 100 SS fork. I am now looking for a second bike for more technical single track and because of where I live availability is somewhat limited especially when it comes to FS. In a local shop the following two bikes are available: TREK ELITE 8.9 vs TREK FUEL EX 4. Can anyone guide me on the best choice?