of that list you have there, the 1HZ would be my choice, specially if everything else around the engine and the body + chassis its strapped to are in the best condition. The 1HZ on its own will go anywhere, just never in too much of a hurry. It takes a few days to get used to it - but its a great engine. Drive it, make sure you get a feel for it, because as
@Firewout said, you will be looking for the 3rd gear a lot more than you would with the 1HD.
I often drive in convoy' with 80's with their 1hdt's and while they all pull away at the traffic lights, they are never far off - and down a mile or so, everyone's doing 70 anyway, you might just be doing 200 odd rpm more than the 80's and the 100's.
fully loaded, I have towed a defender 110 across off grid tracks near Urzulei in Sardenia ( nearly 40 km ) .... a belgian couple and their mercedes mwb camber out of bog ( on top of a cliff, at that ) on Harris island ... even towed a 2.5T load ( swb patrol ), from Brno to Bratislava, in Jan 2019 - during the infamous snow dump. So if you are concerned about effort and reliability etc, dont be - more often than now, the high number LC's you find in Australia etc, are running the 1Hz. And having known lots of people and vehicles with other engines, I definitely dont think its any lesser reliable than the 1kd / vd / 1hd. And part availability has never been a problem - some things are harder to find, but never impossible, and usually in the same sort of price range as the HD's. And I dont believe there is much of a difference in fuel consumption (?). Some of the maint cycles are different - eg. Engine oil at 3.5k Miles
anyway, just my 2p worth - buy the vehicle for the quality of and the potential of the condition of the metalwork, the care its been subject to and the life you may get from it.