I have several Tamiya tanks and several HL and WSN tanks
the Tamiya ones are more expensive than the HL one is because they have put a lot of time and effort into reasearching the tanks they make and HL are as far as I can work out are copys of the tamiya article
My hl tiger has cost me several hundred Pounds to get it to a decent running standard where the tracks don't come off, the idlers don't break their shafts and all of  the running gear is aligned properly. you do not have to do this with a Tamiya kit
the only copmplaint I have about tamiya tanks is that they do not put proper bearings in them for the susspension and road wheels
also the return rollers on the Leopard model are crap and for the money invested in the kit they could have been a lot betterwith proper bearings in them.