I think that it is probably correct to say that an Airbus is more tricky for the pilots once out of normal law than a Boeing is.
This is reasonable, because suddenly not only do you have a problem, but your aircraft suddenly changed a bit and all your natural responses are not quite right any more.
That is not the whole story though, is it.
Accident statistics show that Boeing and Airbus are each as safe as each other, which can only mean that whilst the systems in an Airbus are actually working, the Airbus is safer to offset the Boeing advantage once non-normal.
That would suggest that if you can make the automatics more reliable, the Airbus wold be the safest?
Since the Airbus systems are frankly archaic, that should not be too hard.