Aggressive and simple are quite hard to satisfy simultaneously. If you like aggressive but not heaps of theory, your king’s Indian is a good shout. For white, your two options there are probably not the best for you: the London is simple, but it can be difficult to make it aggressive at your level (though the jobava London is), and the ruy Lopez is about as complicated as you want to make it.
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Which chess opening should I use for white: London system or Ruy Lopez
Note I like aggressive and simple openings….