" Jim of course claims that there are other non PR systems that are better but we never seem to hear of them."
This isn't entirely true -- I think around 2015 I was quite actively suggesting a couple of alternatives. It is true that lately I've just been moaning about FPTP, but since anyway the debate can only move forward if people accept its flaws -- and OG, in particular, seems keen to defend it as the best system possible, flying in the face of all the evidence (and also, curiously, regarding anything that is not FPTP as PR, which is also simply wrong) -- I'd tended to stick to just that.
The one generally regarded to be the best of all worlds is Single Transferable Voting, but for anyone interested enough they shouldn't have to rely on me naming systems to find out about them. There are plenty of places where systems, and how to evaluate them, are discussed far more thoroughly than I'm capable of.
Besides which, the answer of what is better is, as I've said, heavily dependent on what matters to you. A representative that you can regard as your own (in which case all pure PR systems automatically get trashed), or a parliament that reflects the varied opinions of its people as closely as possible (in which case constituencies become irrelevant)? Or both as once, if at all possible? STV can be regarded as "both at once", as it's well-suited to multi-seat constituencies without needing to be applied across the whole country.
I suppose the second consideration is, as you say, related to "effective government". I'd argue that non-FPTP systems haven't had a totally fair trial in practice because everyone distrusts them. Perhaps, if coalition governments occurred more often, they'd start to work better because they became the norm and people would be used to them. As it is, the Tories (and Labour, to a lesser extent) benefit from maintaining a system that locks them together in a cycle of power, to the expense of all other parties, who can just shout a bit loudly.