We have a 4 post with a jacking beam that is air powered.
Works a treat especially if doing a clutch on a landrover we have fabricated a cradle to fit bottom of r380 or lt77 gearbox.
Mean you can slide it back do clutch slide it forwards..
No lifting.
also if the vehicle is dead and on a trailer we back the vehicle up to ramp and if you are accurate can roll it straight off and on the ramp...lol
our beam slides right to the front of the ramp out of the way.
Only issue we find is if working under the bonnet from above you are forever stepping up and down to get on the ramp..
Took the wheels off mine and lowered it on the air jack for one job made life easier.
Jacking beam is also useful for pushing wishbones up into chassis etc..
and finally if doing a chassis rebuild or body off, the farmers son did a disco. unbolted the body, ramp up as high as possible, slung body of the RSJ roof beams, lowered ramp and rolled chassis off, then Ivor Williams trailer onto ramp. Ramp up lowered body onto trailer drove it away....lol
we used to have a pit, have filled it in, used to be handy for working on tractor crawler tracks back in the day...
However it will get water in bottom and it stinks also have to be careful what you park on it when it was covered, and ours had sleepers on it cut to size etc.. (ours was in concrete floored workshop inside with concrete pit)
clutch job putting a gearbox back in a landy involved two people stood in pit...( try lifting a gearbox and transfer combo above your head even after 3 weetabix..) wit two people inside with a scaffold bar and strap lifting it up.
then holding it while wiggling adjusting to get lined up and bolts in....
me i would take the ramp any day,, mate has a 2 poster which works well, just haven't worked on my landy on it..
having used all 3 options...
At one point we had ramp and pit in farm workshop...always a queue for the ramp....pit was rarely used
2 poster can be a pain if you have just parked vehicle in between posts but not using ramp, find you can't open the doors..but wheels free can be useful re propshafts etc and having to turn wheels.
our four posters involves a faff of jacking beam to rear and then two big tripod stands made of builder style jacks for holding floors up when you put in an rsj then jack to front etc..
other thing we have found at times if required you can get a trolley jack on the ramp to push up suspension components to refit after balljoint etc. change, also good lever point with a big bar off the ramp..
personally i would forget the pit and go the ramp option both 2 and 4 have advantages and disadvantages as listed above..
what ever comes at the right money will do...