Btwin Rockrider 340 or Drag Hacker "with mod" Help

multimedias

Which of the following do you think I should choose- B'TWIN Rockrider 340 (offered by decathlon) http://www.decathlon.co.uk/rockrider-340-mountain-bike-black-id_8302231.html ~127.90£ from local decathlon
or
the Drag hacker offered by the local bike shop (it is modified and it comes with additional extras- frontal air cusion, just like the Rockrider)
http://www.dragbicycles.com/?menu=product&id=277#specification ~109.90£
The difference is that the Rockrider has single-walled rims and the Drag hacker has double-walled rims.

The Rookie

For what useage?

Neither is a 'mountain bike' as we would currently use the term, the Hacker has a heavier steel frame but the forks are quite possible lighter than the forks on the RR which are frankly nasty and horrid things, so for on road and light duty gravel tracks I'd probably take the Hacker of those two, and if you are using on road only I'd get some lighter slick tyres which will make it much nicer on road.

Not sure what you mean by frontal air cushion, the front forks on the RR use a coil spring not an air spring, and I'd prefer the original hacker forks to cheap and nasty suspension ones which will also upset the geometry by being longer than the original forks.

multimedias

I need a bike that would easily go about 20-30 kilometers a day for about 3-4 times a week. Mainly between cities and through rough terrains.

cooldad

Depends on your definition of 'rough terrains'.

multimedias

mountain trails

The Rookie

Which could be anything from hard packed gravel which is little different to rough Tarmac to something much much rougher. Neither is really that good a bike, you ideally need to stretch your budget to the Rockrider 500 series.