I have said in here before that I would not use the Max. Not because of safety issues as the original problem was fixed. But the problem was created by Boeing for monetary reasons and some airlines were also part of that. My not travelling on the Max will not be noted but I will not do it. This latest problem may (or may not) turn out to be a manufacturing problem. I expect that millions of people will be safely carried by the Max but it does not change my view.
The 787 is in related territory. Thus far I have only done four sectors on it and can see/feel no advantage to me. I understand the advantage for the operators. Thus far, the 78 has had longer to have design problems addressed but we have yet to learn about any manufacturing ones. It looks like I may have to use the 78 later this year as the operator is not giving me any options - even though they originally said that the route in question would be served by a different machine.