Its. dependent on the map, current situation, direction of development.
It really does. I should point out that you always start with irrigation, mining, and roads in Civ 1, though, so they are not among the variable factors.
At least after the wheel, my go-to conquest path is this:
Navigation - this is important for a conquest victory unless on EARTH, and it has 8 prerequisites. +Wheel that's 9 techs before zeroing science. In excel, I can plot out the rickety path to dodge the disabled-tech rotation on the way to Nav, but when a bullied or captured AI gives me tech, the sequence gets thrown out the window. Very very disrespectful!
also after the wheel, here are my thoughts on space
Democracy - Dem has 7 prerequisites. On Emperor this is 512 lightbulbs minimum. With the wheel beforehand it's 639 bulbs minus any Dem prereq started-with or looted.
• It's tempting to just discover Masonry (pyramids) instead of teching all the way there.
• Can you gain anything by beelining Trade (vans) to help build the wonder? Trade has 4 prerequisites. That's a lot of foregone early gold. It doesn't seem worthwhile to me, at least. All I can do is found a sub city with good shieldgrass, swap-buy a city walls and/or palace towards the Pyramids when you can, and it will be ready eventually.
• Republic requires one tech, that being itself, which lies out of the democracy beeline but it seems worthwhile to me if you get it before CB and Mysticism (and assuming you aren't racing on the pyramids).
Stuff I tend to avoid:
Monarchy - this does not fit conquest because it causes you to have to pay maintenance on units. wtf. Researching it drastically slows the research path to democracy, so it's a loss on that too.
HBR - the wheel is just more effective than this. I have not actually researched this tech before fusion since 1991.
Libraries - Backburner... optimally, build marketplaces and temples, and next WLTK concurrent with banks. I would only suggest building libraries after this point. Only when the pop is large does this building stand out among other important build options. This is somewhat in contrast with more recent Civ titles.