The linked 'duplicate' question asked for a 'rule', which usually means something unambiguous that is built into the grammar, and the answer was no. I am specifically asking if anyone can suggest a good aide mémoire to cover most cases, i.e. a 'rule of thumb', which though similarly named, is very different from a rule.
An old question asked if there's a 'rule' for "–ance" vs "–ence", and the answer was no.
Can anyone suggest some kind of mnemonic or reasoning that will help me intuit the correct suffix most of the time, when I don't have access to a spellchecker?