M+ are massively better than anything, if your priority is avoiding punctures. I've used them on the brompton for about ten years of daily commuting and they have punctured once — that was when I wasn't looking and went over a half-bottle standing upright. Even that, something that would have normally destroyed both tyres, only punctured one and it was still in a fit state to ride after the inner tube repair. By comparison, when I changed brompton but hadn't got round to changing the tyres I had three punctures in a single wet morning.
They are not nice to ride, definitely slower, but not too bad if you pump them up to the rated limit which is somewhat higher than expected for the size.
I would add to Brucey's list: e) ride well away from the verge in the line of the left car tyre.