These days the geos on decent new mtbs are so slack. So in the nicest possible way, a full sus will be a waste of money for anyone with little riding experience, even if you could afford it.
You need to be asking what type of riding you're really doing. MTBing is very open ended. I'd get down to a decent local shop if you have one. Sadly many of the shops don't have truly experienced riders working for them, but that's a generalisation. Some more reading on the subject may help in your purchase. A decent shop will try to get you to answer the question of what type of riding you want to do in depth.
You'll need to take into account servicing requirements and cost, as well as pedals, saddle and grips for quality of life improvements. Tyre choice tends to be more noticeable with experience. Cockpit room is variable despite guides, as all riders are different, shoulder sizes and muscle sizes will change bar requirements which effect the cockpit feel. You can go pretty deep with this, but my point is that there is no best when specs vary little at similar price points.
If you just want to tear about in the woods a bit even full rigid is fine. A big hardtail could be hard to control also. You can change tyre sizes, compound and pressure to accomedate for lack of suspension which allows the budget to be spent on drivechain- the place where things will go wrong. If you intend riding many miles on the road sometimes lugging about a big bike with less gears would suck too.
Or just go with whatever looks okay. £1k is a good enough amount to not have the bike break on you easily, or degrade quickly. But lack of TLC will kill off any bike easy enough, or result in further costs.