Any attack strategy you are good at can become a 3-star strategy with a little tuning.Ive enjoy hogs, and dragons. So I use both of them, hogs to take out an AD or two, and dragons to sweep over the rest of the base. Easy 3 star on max TH8.If you like air attacks, try some dragon attacks. Dragon and balloon attacks can easily 3 star any TH8 base. If anyone wants to challenge this, I can send proof.If you like ground attacks, hogs work, and then GoHo when you have your golems.I use level 3 hogs for my hog attacks, so dont worry about maxing them out, although im not saying leave it either. It will help, but its possible without it.Good luck, whatever you choose.

