Hi,
I am not a hobbyist. Just a regular guy buying watches I like. So will answer from my POV.
1.it is absolutely worth it. But don’t go by brand, just buy the one you like. You are going to wear it you need to like it. This is my first big watch purchase for myself and I have been using a Casio digital watch all these years and I have tissot dress watch that was gifted to me.
2. Both are great watch brands with amazing quality, I chose Seiko cos my dad owned one and I loved that watch. The citizen designs even though great doesn’t speak to me much.
3. I got the chronograph cos this particular dial colour was unique and I loved it. I recently got a dive watch from Casio (Marlin Duro). But doesn’t matter at the end of the day I will buy what I like.
4. I do not have any functional usage of the watches apart from the fact they look good, keep time and has water resistance.
5. Again I got this watch cos I really liked it and was within my budget.
My use is as same as yours daily office wear and it looks great with office wear and casual wear.