Ownership will be much more expensive than renting. BUT I found renting impossible - if the weather was good. And forecasts seldom accurate enough to book in advance for more than one hour. I bought a share 31 years ago. I'm still owning today.
The really good thing about Syndicates is that many (most?) members don't fly enough to make it economical for them, leaving plenty of hours for a few to fly. As long as each hour flown is making a profit, we're doing them a favour by flying the aircraft.