they are both high quality bits of kit. You can not go wrong with either one.
both have a vice that will offset the centre of rotation that is handy if you are engraving under a microscope because rather than shifting the piece on the clamp you shift the rotational point of the vice which is quicker and easier.
for the most part it is cosmetic. I personally like the look of some of the lindsay equipment better than the GRS and although they have some differences in application once you get used to the gear you soon find that both are very close in quality.
Get the one you like the look of best
just my opinion