1v1's and 2v2's have a longer early and mid game, hence the recommendation for Scavenge. In those game modes units like the JT are extremely rare, basically you just won't see them. Whereas in larger game modes you may see them every game.
The first 3 I suggested will still prove useful in 1v1 and 2v2, and there I think fortifications may even shine more. In those game modes definitely do not use elite armor.
If you are losing before late game I would recommend starting with Scavenge as it will bridge your early game into the mid game. Use Jaegers at distance, especially targeting low health squads and you will not be disappointed. You should, whenever possible, have them stand to fire, moving reduces their accuracy and since their sniper fires slowly you want every shot he fires to count.
Starting small is fine, it will remove any excuses you might have about your teammates not playing well enough. You are always welcome in larger game modes.
I see, I can really use this information!
A few more questions, (even though i'm probably asking too much).
1. When would you go for Luftwaffe or Scavenge though, on what do you decide that?
2. Scavenge and Luftwaffe both have elite units like the Fallschirmjäger and the Jagerlight recon squad.
I am not sure which one is better as they're both flanking units and need to stay on long range (although the Falls are probably better close range despite being squishy?), so wich one do you think is better and what exactly is the difference between the 2? Also how are Obersoldaten compared to these 2 elite units?
3. And how is the ober compared to these 2 units
I have the feeling that they're all both kind of the same unit apart from the abilities.
Maybe I am asking too much, but I simply don't have the answer for these questions yet xD
I am currently using both, and i'm not sure which one I prefer more yet.
Thanks for the clear answers btw!