I don't have any experience with either, but which ever company you go with ask for a Spec sheet as that will tell you a lot more about what product you are getting. Also TNVC used to carry GSCI thermal so that does say something of the product they do put out.
None of my business but I don't know the regulations with hunting/varmint control at night in Alberta but you might want to check before you buy a rig you can't use and if its for smaller calibre rifle you should be able to get away with a pvs-14 as a mounted option.