XC Mountain bike

I've been cross racing for two years (road racing for ~11) now and looking to get in to XC mountain biking. I live in East Anglia so I imagine it'll be mostly tamer courses and races that I end up doing.
I was looking for some advice choosing between the following (or indeed anything else to consider):
BMC Teamelite TE02 Deore/SLX 2017 - £1300: Reduced by £850 and still the most expensive. Not sure I like the idea of a 2x system after running 1x on my cross bike. I think also the heaviest of the bikes. However, the most discounted so does that make it the best?
Giant XTC Advanced 29 3 2017 - £1050: Not sure I like the boost stuff but other than that looks good. I prefer SRAM for road/cross and I am wondering if it will make things like bleeding brakes easier if I only have to have one bleed kit/method of doing things (is the bleed process similar for road hydro vs mtb hydro?)
On one Maccatuskil: Probably the most budget option. I have had a Planet X bike for 6 or 7 years, a lovely road Ti bike and before that I have a pro carbon SL. I know they get a lot of stick but I think some of their bikes are great value (but I don't know if this one is). Again, I like the simplicity of SRAM 1x groupsets. Also have the option of choosing between SRAM NX1 (£999) or SRAM GX Eagle (£1200)
I will hopefully be using the cycle to work voucher but have been told I can top up the value for the bikes that are over £1k.
Any thoughts, advice, etc...
Also, any thoughts on sizing? I am ~5ft 11 and normally ride a 54cm road bike with a 12-13cm stem and quite a bit of seatpost. I am thinking 'medium' for the bikes above but not really sure how road bike fit translates to MTB fit
I was looking for some advice choosing between the following (or indeed anything else to consider):
BMC Teamelite TE02 Deore/SLX 2017 - £1300: Reduced by £850 and still the most expensive. Not sure I like the idea of a 2x system after running 1x on my cross bike. I think also the heaviest of the bikes. However, the most discounted so does that make it the best?
Giant XTC Advanced 29 3 2017 - £1050: Not sure I like the boost stuff but other than that looks good. I prefer SRAM for road/cross and I am wondering if it will make things like bleeding brakes easier if I only have to have one bleed kit/method of doing things (is the bleed process similar for road hydro vs mtb hydro?)
On one Maccatuskil: Probably the most budget option. I have had a Planet X bike for 6 or 7 years, a lovely road Ti bike and before that I have a pro carbon SL. I know they get a lot of stick but I think some of their bikes are great value (but I don't know if this one is). Again, I like the simplicity of SRAM 1x groupsets. Also have the option of choosing between SRAM NX1 (£999) or SRAM GX Eagle (£1200)
I will hopefully be using the cycle to work voucher but have been told I can top up the value for the bikes that are over £1k.
Any thoughts, advice, etc...
Also, any thoughts on sizing? I am ~5ft 11 and normally ride a 54cm road bike with a 12-13cm stem and quite a bit of seatpost. I am thinking 'medium' for the bikes above but not really sure how road bike fit translates to MTB fit
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Those are all quite racey xc bikes, not not very forgiving handling and harsh ride quality.