I am broadly in favour for a couple of reasons.
An elected Head of State gives us the likes of Trump or Blair, career politicians in it for personal gain.
I accept that the monarchy system isn't a perfect alternative, it's a gamble - and luckily Charles was born first, before Andrew. But at least the ones in line know what's in store for them and they can either bail at the first opportunity or decide to get on with it and do the best they can and learn from those further up the line.
The Queen was well respected by other heads of state because of her depth of knowledge and experience, she had probably seen most eventualities and had the benefit of a lot of hindsight. Most of our own prime ministers appreciated being able to talk to her. She didn't tell them what to do, but she would have been able to comment on what happened last time and why. She took the job seriously and kept up to date with home and word events.
If we have a head of state then let's have one that appreciates the office and what it stands for, and one that is well respected and one that is in it for the long haul, and not just for there own 15 minutes of fame. If we are going to do it, let's do it well.
Charles used to be laughed at back in the 70s and 80s because of his speeches on plastic waste etc. He was right.
His Princes Trust has done so much for young disadvantaged kids, and helped others who weren't so disadvantaged but needed financial backing to get small business off the ground.
I have a lot of time for him.
Monarchy isn't perfect, but when it's done well it can be beneficial in ways elected heads of state cannot.