The Queen is exactly what a monarch should be. Her father was a good king. Charles, though less appealing than the Queen, would also be a responsible king, as would William. I don’t think we have any immediate prospect of a bad monarch like some in the past. If we did get one, I think these days they would not be tolerated. Until that happens, I’m in favour of monarchy.
Rabid republicans I know - and there’s a few of them, some in my own family - all seem rather sour, resentful people with chips on their shoulders. I’m sure there are moderate, pleasant republicans, but I don’t seem to come across them.