There is one specific plane type (Airbus A320) that has significantly more fume events than all other plane types, suggesting that plane type or associated engine has a design or procedural flaw.

Since airlines consolidate on specific types, it is possible that some travelers experience this problem often and others very rarely.

Through no choice of my own, I seem to only fly on Boeing 737s, but the one recent time I was on an Airbus (A321neo) there was a distinct exhaust odor upon engine startup.