I don't see the need for arguing the differences of opinion about this option, as both have pretty good and correct points in their own right.
I agree the worker or having Pioneering at the start are still the best options, and soldier is probably the least helpful option for general use and whatnot. However, I do see how it could be used effectively. (And remember I still agree it's probably the worst cargo option, don't bite my head off please)
- Extra "scout" to gather resource pods, which is pretty nice
- If you want to try going Might early on, it would help getting started with attacking aliens and nests faster
- Gives you an extra unit towards dealing with early war
- On a small map you may have closer neighbors than usual, meaning more likely to face early DOW
On low difficulties, okay, sure. On Deity you can't really attack until you get at least affinity 4 or, so what use are those military units?
This is not true at all. Playing purely Apollo, I've had a number of very early wars, so an extra soldier would help in those situations. As soon as you've upgraded to gunners from affinity 2 you're able to take on a close AI and even take their capital with a handful of units. Affinity 3 you can have Armor with are stronger than the marines but depending on the war you may not be able to pump many out in time, and you'd want to focus on Gunners anyway(I recommend at least 4 gunners to take a city at a fast pace for that stage in the game).
I think it's similar to how artists are imbalanced as a better pick than the other options for their category, while pioneering or worker is the same for this selection. They absolutely give more consistent and general benefits.
It's just that the soldier still isn't crap despite that. Instead it can have its general uses as stated, though again not as consistently useful at the start, or it can also fit into other strategies. Everybody and their mother goes for prosperity followed by industry off the bat at the moment, but a soldier would specifically give a big benefit for anyone trying might early on for helping get that science from aliens rolling in faster.
Nobody's saying it's the best cargo option, since it isn't. It's just it does have it's uses, especially if you specifically pick it for reasons such as the above. No need for anybody to fight.