Help Choosing 1 X 10 crankset for cross country trails

bjellys

Retro Guru
Hi I have just been given this by my postie. https://www.mbr.co.uk/reviews/hardtail/gt-zaskar-27-5-comp-2016-review
which I want to change from 2x10 to 1x10 as the 2x crank set left arm is knackered.
I have seen this set which comes in 170mm & 175mm arm length and 30 & 32 tooth options.
what I would like to know should I go for 170 or 175 and 30 or 32 teeth
the rear mech can only do 11-36 I mainly ride forest trails
Thanks in advance.his
 
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