This is not so much a "head to head" review. It won't be fair to have these two chairs put against eachother.
One is £80 (the better one) and the other half the price. Having used the cheaper chair for under a month and started to fell apart, I decided I have to upgrade.
Now the Fox Duralite didn't have any use, as I am writing this I've just took it out twice. So I guess I'll see how it fairs better after about a month of usage.
I guess if you're on the lighter side, I'm 90Kg, the cheap Q-Dos might fare better and last longer as well.