Choose the techs that get you SS parts. Sounds dumb enough, but why go for recycling when you can win the game in a few turns? Get Space flight ASAP so you can start the Apollo wonder sooner.
Of the choices that lead down to SS parts, I usually go for Nuclear Power Sooner so I can get a Nuclear plant in my super cities and boost my production. You need it anyway to research the Laser to get a part. I coupled that with an Iron Works in my last game - oooh, 150+shields/turn baby
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All I've needed is maybe 3 good cities that are my SS builders. At that point, my cities don't need many more improvements to change the outcome of the game. Tthe rest of my cities are building units or wealth.
In the Industrial Age, plan your 3 producing cities and make sure they have a power plant before the Modern age so building your Nuclear plant doesn't take as long.
You may want to not be in Communism because of corruption in your core cities. You can be in anything else & still be ok (even Monarchy).
If there is a Civ to be for a space race, I'd lean towards a Scientific one (you can make a case for the others too, Commercial wouldn't be bad). Getting a free tech at the Modern age can give you a leg up. Assuming you are likely to have more libraries & universities means you will likely have a better tech rate in the modern age and get to the techs sooner.