Because research costs of troops are really high and takes a long time as levels increase, it is more valuable to focus on a particular set of troops for both war, farming and castle defense.
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Farming: So it is generally accepted that barbarian, archer, goblin, wall breaker, minion, giant + healing, rage are good for farming.
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Defense: Archer, wizard, dragon, minion are good for castle defense.
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War: All dark elixir troops, pekka, dragon, healer, balloon, wizard, wall breaker, giant, archer + all spells are good for war.
While we don't have too many choices for defense, we have a lot of tactics that can be used on offense with mixing different troop and spell combos. Various types of barch, tank + dps, tank + healer, all air etc..
I am looking to only upgrade and only train a minimum amount of troops but still be very effective in all aspects & stages of the game. Theorycraft based answers would be appreciated or Town Hall9+ players with experience.
So what is the best attack compositions to focus on general?
Best Answer
The game's meta shifts pretty quickly, so unfortunately there's not just a few types of troops that you can upgrade and hope to be ready for every situation. My advice would be to practice some of the major strategies. When you come across one that is particularly effective and you can deploy it consistently, make sure you focus on unlocking the upgrades for that particular strategy first.
Let's be honest as well - for most people, the only thing that consistently pays out is collector farming with cheap armies. Clan wars and trashing bases for storages/trophies are nice for the "glory!" factor, but they're generally going to cost you resources, which costs you time and/or money.
That said, I'll try to cover a few types of attack that work well with the current meta, and what troops I personally prioritize:
Again, here, what I'd suggest is practice a new strategy, and if it works for you, then upgrade the troops. I'd also suggest upgrade everything before you bump your TH up, because you never know what the next meta will bring to previously useless troops. It's almost always easier to raid and save up for your upgrades at a lower TH than at a higher TH.