Discussion of level 4 monsters.

Yes.
It's a good unit. There will definitely be enough money for it. But angels require significant funding. They have a pretty good ability to spread out. Although angels are also not bad. Still, I think marauders are much more versatile.

Many consider champions to be much weaker than angels. Although here, too, everything depends on tactics and the situation. If the game is fast-paced and there are very few rare resources, then you can build champions. And quickly buy growth and attack while the opponent hasn't bought/built their level 4 monster. Although even for such a tactic, angels are slightly preferable. If the game is long, then angels are bought. Betting on champions is risky, although if you manage to strengthen them with tactics and take advantage of their speed advantage, then why not build them?