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qclabrat: Thank you very much for your kind and helpful input.
Have another, regular (but fun :-) commuter bike with the known Marathon Plus tires. They feel different and yes, are a bit heavier, but you get used to them quickly. A good choice for my needs. Original tires were Continental Speed Rides, which are fun but quite thin. Thorns got me in trouble multiple times. The type of flat I got on my MTB was caused by a thin put sharp piece of metal though. Maybe bad luck, because every new bike seem to give me a flat in the first weeks.
Given I’m good with my regular bike and M+ tires, I might in the near future choose to upgrade my (lightweight) mountain bike to the MTB-version of the M+. Good point: pressure goes a long way.
I know some say go tubeless, but I guess I like being a bit old school and enjoy the sometimes extra training :-) Only not the change-a-tire kind of training.