Siri isn't very strong, it can answer (very) basic questions and resorts to web searches when it can't answer. I find it occasionally mishearing me or completely parsing my question incorrectly. I recall a particularly bad one: "set a timer for 3 minutes and 15 seconds" and somehow it interpreted it as an arithmetic question "the answer is 18."

Alexa and particularly Google Assistant are much better, the latter retaining context between questions e.g: "who is the 44th president of the US" followed by "who is his wife?" is a neat trick.

No way. Hello Google is miles better. Google got the upper hand on AI currently. You can see it with their camera AI technology Pixel 3 is top dog in camera even though it have one len.

But Apple just took 2 famous Google AI researcher. So it seems that Apple is trying to catch up.