Yeah, dunno really. Is it worth making a further distinction between mortgage-havers and people who haven't paid their mortgages off? I suppose it's easy to roll both into the same category of "homeowner", but if you're paying a mortgage off then are you that much more secure than a renter?
Depends what sort of renter.
If someone is a council/social/affordable housing renter, then their tenure is relatively secure.
If someone is a private sector renter, they have very little security, beyond the initial... six or 12 months? of an Assured Shorthold Tenancy. So many private sector tenants get served with possession notices/evicted, because the landlord wants to sell up, which is happening more and more.
iirc, private sector landlords can no longer offset mortgage interest on their profits, and the regulatory requirements are becoming more and more onerous in terms of quality and safety, (gas and electricity safety tests, Energy Performance Certificates, etc), which is no bad thing, of course, from the tenants perspective, but for many landlords the additional costs, coupled with substantial losses if they get a bad tenant who stops paying the rent, they incur the legal costs of eviction, and then often the bad tenant has trashed the place, causing £thousands of damage, and the deposit doesn't cover those costs...
Not all landlords are bad, just as not all tenants are bad. And don't forget, many Buy To Let landlords are relatively ordinary people in relatively ordinary jobs who have invested in property as their 'pension', because they saw what happened to the Maxwell media pensioners, the Rover pensioners, and so many other people who'd worked all their lives and then got fucked over by thieving fuckers who raided their pension schemes. So many people have ended up figuring they've got to look after Number One, because the company you work for isn't going to, the government isn't going to either.
But all that means is that private sector renters are vulnerable to the knock-on effect of being susceptible to the changing circumstances in the life of their landlord, and the risks and amount of work that landlord is prepared for.
I'm in a couple of landlord groups on Facebook, because I was thinking about renting out my flat if I end up working away, or maybe getting a lodger.
Lots of landlords are either selling up, or thinking about doing so. So renting in the private sector is going to become more and more unstable over the next few years, I think.
The best kind of stability, I think, is still 'getting on the property ladder' and aiming to be mortgage free in a freehold property, not leasehold. But I know that's not an option for everyone. It's bad enough when it's adults who are impacted by the whims of landlords, but when families with children are having to move every couple of years, it's awful.
I don't think the government has properly studied or taken account of the impact of insecure housing on small children especially in their formative years. I have friends who moved four times in the first six years of their daughter's life, because of landlords selling up and them having to move, only for the same thing to happen again. And I know someone else who ended up homeless and living in an hotel room then temporary accommodation with their primary school age daughter, after their landlord wanted the property back that they'd rented for years, paying the rent promptly, no problems. The landlord probably wanted to either sell or maybe renovate and rent out for a lot more money, which is another thing they do when rents are increasing rapidly, ie get rid of the current tenant, give it a lick of paint, then rent it out for an extra couple of hundred a month.
Private sector renters are screwed, and it's only going to get worse.