Jamis 2013 Durango Race Mountain Bicycle when is 26″ the best?

26″ mountain bicycles offer advantages over the large wheel models now out:

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DISCRIPTION
big wheel bikes may be all the rage, but they weigh a lot too. Our Durangos drop at least 2 pounds over any comparably equipped 29’er. They’re versatile and well-equipped and the perfect bike to hit the backcountry and discover what mountain biking is all about.

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SPECIFICATIONS
Frame
7005 triple-butted aluminum main tubes, over-sized seat tube, sloping radius top tube, S-bend down tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger
fork
RST Aerial TnL, Air spring with Turn-n-Lock lock-out, magnesium sliders, 32mm stanchions, 100mm travel

headset FSA zero-stack internal cup threadless, 25mm shim stack, 1 1/8″
Wheels
Alex TD25 double-wall disc-specific rims with reinforced spoke bed rims, 32H, Formula Hi-Lo flange sealed bear- ing 6-bolt disc hubs, 14g black stainless steel spokes

Tires Geax barro Mountain, 26 x 2.1″
Derailleurs Shimano XT rear and Alivio 34.9mm top pull front
Shiftlevers Shimano Alivio M430, 9-speed
Chain: SRAM 951
Cassette SRAM PG-950, 9-speed, 11-34
Crankset Shimano M430 Octalink, 44/32/22, 170mm (13-15″), 175mm (17-21″)
BB Set Shimano ES25, Octalink, 68 x 113mm
Pedals Alloy platform with steel outer cage
Brakeset Tektro Draco 2 hydraulic disc brakes with 6″ wavy rotor
handlebar Jamis XC alloy riser, 31.8mm x 8 ̊ sweep x 25mm rise x 680mm
Stem Jamis XC alloy threadless, 10 ̊ rise x 90mm (13-15″) 100mm (17″) , 110mm (19″), 120mm (21″)
grips Dual compound
Seatpost Jamis OS alloy micro-adjust, 31.6 x 350mm with alloy qR clamp
Saddle Jamis ATb Comp with pressure relief channel
Sizes 13″, 15″, 17″, 19″, 21″
Colour Gloss black/Yellow or Gloss black/blue
Weight 30.50 lbs

Advantages of 26”

1. Usually you can get a great deal on an older model so you get the best parts for the money. 
2. Easily available parts if you are travelling and less money for them.
3. Best for short and or light weight riders. 
4. Lightest of the three bicycles. If you run up steep hills with the bicycle on your shoulder then this is the best choice. 
5. Low stand over height so good if you have short legs. 
6. Best Acceleration of the three even though 650 is close so great on switch back, tight corners and through trees and slalom.