Squad Building Challenges are…well, exactly that. You’re tasked with doing something and if you do it, you get something in return. SBCs are easily the hardest of the three modes to accomplish anything in, but when you do, you’re rewarded in a fitting manner for all of your trouble.
Squad Battles are on the opposite end of the spectrum. Due to the player being able to choose his opponents and difficulty level, it’s much easier to win that way. Of course, the prize quality drops as well.
Division Rivals surely holds the title of most engaging of the three. In addition to the regular coins and packs that you get for winning, you also gather Champions points. Gain 2000 of these and you’ll be granted a pass to the Champions Weekend League where you compete against the world’s best for some truly squad-altering packages.
Equally important for your coin budget’s well-being is what you do on the market and how you spend the coins you’ve obtained. Search the web and every coin tutorial will tell you the same thing: don’t buy expensive packs. Packs are random, ok, you might get something useful, but more often than not, you won’t.
Instead, try to stick to Bronze and Silver packs and see what you can sell on the market, what you should keep for your squad or what you could keep for now and sell at a higher price later on. Similarly, keep an eye on the cards that go for sale. With an eye for a bargain and some luck, you might strike gold. Finding such bargains is the main key to building a bank once you’ve established a solid foundation through playing.