Picking a new MTB

need some advise on a new MTB for off road mostly , I have £1000 to spend and i have been looking at a few bikes like Bizango XL i think the reach height is 436mm , also i was looking at the boardman MHT 8.8 xl 447mm. I am 6ft4 34 inseam and not sure if them bikes would be a good fit . just wondering what people think i should get or if these bikes would be good.