I was chatting to a friend yesterday that owns a steel VAN DE STADT 34. Boat about six years old. Was just back in the water after the annual haulout. In the discussion his issues with rust, general repairs etc were pretty similar to the osmosis, general repairs to my fibreglass boat.
One comment that stuck with me though was on the next boat. It was definitely going to be a fibreglass boat.
On rust the main comments were any nicks / scratches had to be repaired immediately and problems with inaccessable spots. On his yacht there was a problem with accessing the deck above the chain locker and he was concerned the area was rusting out.
All boats require maintenace. It really comes down to do you prefer mucking around with chemicals / epoxy or welding? Scraping / sanding metal or fibreglass? If you have any skills / experience in welding that would be a big plus.