GrumpyGregry
Here for rides.
I'd argue the opposite. Best (subjective judgement) frame you can afford and don't fret about the finishing kit compromises to get it. Everytime. Those wheels and gears are going to wear out and need to be replaced decades before the frame needs changing.Agree with KneesUp, Boardman spec is lighter but only slightly. I'd concentrate on the equipment that each bike comes with (gears and wheels mainly), then ask if you can justify £170 extra if you feel the Boardman is better equipped.
You could also watch Halford's prices while your making up your mind, because they often play around with them. You may find they knock off £100 one weekend.
I think both bikes will be pretty good for that sort of money.
Good luck
And for my money between the two? The Boardman. But I'd go to Decathlon too.