Donāt take this the wrong way, I expect you have already exhausted yourself researching this elsewhere and have read every pro, con, conflicting opinion and AI summary available, so not sure there is much to add to there 
But it sounds, more than anything else, that what you really need is a well installed network.
A consumer mesh package, however good, isnāt going to magically solve issues in a large house with multiple floors, rooms and solid walls if you just arbitrarily plug in the extenders. And even if installed well, there are limits to how far you can reliably extend coverage with mesh networking before you start seeing a drop in speed or latency. Thereās a good reason installers still run physical cables to WiFi access points in commercial settings.
In the UK at least, many ISP now offer whole home coverage as part of their premium packages, while that makes little sense for a small apartment, for a large house it does mean you can get them to come back and install additional access points where they are needed ā I have non-technical friends who have gone this route with some success. But again, there are limits here if relying purely on mesh networking.
Alternatively find a local network engineer who can guarantee coverage as part of an install, ideally using kit that you can maintain yourself after they leave.
If you want to install the system yourself, then Iād think about whether you can run wired connections to each floor and from there extend out with one or more wireless access points? Or at the very least use a WiFi mapper to help with placement.
If you own and plan to stay in the house long term it may be worth investing in a proper semi-wired network setup built around a prosumer platform like UniFi. Long term this is by far the best way to ensure you have a decent signal in every room and will give you maximum flexibility / control over everything. Or is this a rental or a listed/heritage/architectural property where cable installation is massive no go?
Sorry, thatās not a direct answer to one package over the other. But I expect the biggest issue youāll face isnāt choosing the package itself but getting even coverage across your house with either mesh system, at least without some extra effort in terms of working out best placement. Iād look for reports/feedback on how good each package youāve shortlisted helps with that part, far more than simple metrics of raw signal strength.
But honestly, for a large house over multiple floors, Iād probably get someone in to install a semi-wired network if at all possible. Or look at installing it yourself using prosumer networking gear from UniFi if you have the technical skills and inclination.