Owning both a x2 and a tru trak swivel wheel sulky and owning both a 52/36 Turf Tracer my opinion is the x2 is the best choice for the 36".
Reasons for x2 on 36"
storage when not in use
turning ability in tight quarters
Is the x2 as comfortable as the tru trak......Not even close but the tru trak would manhandle the little 36" and not allow you tight turning ability which on a 36" you want. My .02