I wouldn't get picogus for its gravis part, because its big hassle 😀.
I think gus emulation puts raspery too near to the edge. Games like panzer general, x-com or transport tycoon doesn't work.
I think picogus killer feature is its intelligent mode 401, and all other modes.
I just love the card I've build 5, 1.2 cards for my xt/286 machines.