I've used and like gantry cranes. I also agree that the legs are always in the way on engine hoists. But for the small garage shop where I have a low ceiling a gantry crane is not feasible IMHO. And for one guy who's got it move something my experience is gantry cranes are cumbersome at best.I have both items proposed by the OP and prefer neither. As has been stated by others, the pallet stacker has so little "reach". The typical engine hoist has too little elevation. And regarding both, the damn legs are ALWAYS in the way.
If you have access to used (inexpensive) pallet racking, that would be my recommendation. Two uprights and four beams will make a very strong frame for one-two ton lifts. Put two beams high and two beams low to "box in" the frame. SECURE an additional member (any suitable steel or lumber) front to back, centered across the high beams to support a chain hoist. Lift the machine straight up. Lower the machine onto a pallet (custom pallet if necessary). Remove the lower front beam and use a pallet jack to move the load. Reverse the process when you get everything relocated.
You could mount heavy duty casters to the bases of the uprights and create a mobile gantry crane. Secure any load from swinging.
Buy the shortest length but tallest height (greatest capacity) load beams that will span your need. Load rating charts can be found on-line. Be aware that those charts are for "evenly distributed" loads but your application will not be "evenly distributed" so beware. Do you know any mechanical engineers?
I like having a pallet jack around because all heavy items are setup to be moved with it. I don't need (or want the expense of) multiple sets of heavy duty casters.
The advantage to using pallet racking is that it's modular and easy to erect. If, in the future, you need to span a wider load, buy four longer beams.
Around here I can find pallet racks(good call) but structural steel is crazy expensive. It's interesting looking on different area CL's. A friend is moving into Louisville KY so I did my usual searches that I run around here, machinist(tools), lathe, mill, grinder, metal, steel. There were no import lathes or mill and few hobby size mills or lathes. And what there were like a Bridgeport started at $3500+ where around here they start at $1200 and sometime lower with all kinds of hobby size imports. Theres steel of all kinds were plentiful and CHEAP where here it's cheaper to buy new than to deal with the rusty stuff that people want basically new prices for.
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