The can will work usually for small/slow punctures as a 'get you home' but should be assessed by a tyre specialist as soon as possible. Any large hole or cut won't seal and would be unsafe if it did risking sudden deflation.
Do the dealers list a spare option with a space saver and jack etc? Might be worth considering.
If not your option with the jack, brace and spare wheel wins.
I always take the spare wheel option on our cars and put a can of tyre sealant in the boot as well. Both options covered and would rather fit the spare in the worst case scenario and be on my way in 10 mins than wait for the breakdown service.