There is a third option, but it assumes you
Have a concrete floor that was NOT poured by a drunk or an idiot
Have a FEL equipped tractor (sorta optional)
Aren't on a really tight budget
I have stacks of plywood, etc, in my shop that from time to time get in the way and need to be moved - but 2 units of plywood or more can weigh up to maybe 3 TONS...
So I looked around and found a Jet pallet jack that's rated for 8000 pounds - cost about $100 more than the usual 3-5000 pounders.
Now I'm in the process of building/modifying everything in the shop (if possible) with strong enough stringers across front and back legs that are (1) high enough to get the pallet jack under and (2) low enough to be within its limited range (about 3" to 6", mine raises to 7" IIRC)
My (soon to be) welding table was a "find" at work, where they used to allow us to buy steel scrap for $.05 a pound (yeah, that was a few years back - what can I say, I'm a pack rat :=) - all the table needs is one more stringer across the legs, it's made with 3/8" wall 3x3 angle and 5/8 thick top, about 3' x 5'. I'll add a "sidecar" on one end with grate for plasma, vise, etc, likely with several ideas stol - er, borrowed, from this site mostly - thanx everyone.
Like I said, this option isn't cheap but if you have several things in the shop you want movable, add up the cost of several sets of USABLE casters and the pallet jack looks better all the time... Steve