Need to make my final decision. Polygon Xtrada 5 vs GT Avalanche 2016

# Xtrada:

FRAME: ALX XC Sport 6061 Aluminium, Smooth Welding Frame, Internal Cable Routing

FORK: Suntour XCM-HLO, 120mm Travel, Preload Adjuster, Hydraulic Lock Out, QR Axle 100mm, Straight 1-1/8″ Threadless Steerer

REAR DERAILLEUR: Shimano Deore RD-M4120, 10-Speed

FRONT DERAILLEUR: Shimano Deore FD-M4100-E Type, 2×10-Speed

SHIFTERS: Shimano Deore, 2×10-Speed, SL-M5100/SL-M4100

BRAKES: Tektro HD-M275 Hydraulic Disc Brakes, 2-Piston Brake Calipers, 160mm Rotor

BIKE WEIGHT: 14KG (31LBS)

# Avalanche:

Frame: Hydroformed & Butted Speed Metal ™ Aluminum (TT / DT) Frame, w / Triple Triangle ™, Replaceable Derailleur Hanger, Disc Brake Mounts, and Zerostack 1 1/8 “Head Tube, 27.5 Design

Fork: Rock Shox Recon Silver TK Coil 27.5 “w / 100mm Travel, w / Turn Key Lockout, QR Droupout, Coil Spring, Disc Only Lower, W / 1.125” Alloy Steerer, W / Remote Poplock Lockout

Derailleur: Shimano Deore, FD-M610

Derailleur: Shimano Deore XT Shadow Plus, RD-M786

SHIFTERS Shimano Deore SL-M610

BRAKES: Shimano BR-M396, Hydraulic Disc, W / 160mm Rotor SM-RT30