Well I been playing the game for 10+ years now.
I'm a semi max out town hall 15 with another town hall 13 as my alternative account.
The best thing about the game now are the skins and layouts.
The worst thing about the game is still the upgrading times, for example 20 days for a upgrade is too long.
The best strategy really depends of what kind of attacker you are? Such as are you a flying mob attacker or a ground attacker or even a hybrid attacker. Tons of strategy is at play, so none of them could really be the best because it depends on the base ya attacking. However the most common is obviously the queen walk charge with the picks of your favorite troops.
So far I prefer ground attacking on my main account. My attack strategy is the Yeti/Pekka queen walk smash. Meanwhile with my alternative account is the mass electric dragon spam. Lolz
I'm working on getting my heros to be age 90.