There is no breed-wide rule that resolves every household's decision. Indoor living can reduce exposure to traffic and other outdoor hazards, while a poorly planned indoor environment may leave some cats frustrated or inactive. Consider the cat's history, health and temperament alongside your location and ability to provide safe access. A busy road, insecure garden or previous escape problems may change the balance. Secure outdoor enclosures can be an option for some homes, subject to appropriate construction and supervision. Discuss individual medical or behavioural concerns with your vet.
Whichever arrangement you choose, keep it consistent enough for the cat to understand and review it when circumstances change. The decision should be based on welfare and realistic risk management, not solely on the purchase price of the cat or a claim that all Maine Coons require identical lives. Write down the specific risks at your address and the measures you can actually maintain; a theoretical safe option is not helpful if doors are routinely left unsecured.
For product comparisons alongside this advice, see Paw-Villian cardboard scratcher and Mouse Chase play set. The details below explain their sizes and uses.
Further reading: rspca.org.uk; cats.org.uk; pdsa.org.uk; pdsa.org.uk.
Paw-Villian cardboard scratcher
Mouse Chase play set
Koda Pod