AS I said in another place, I had a thorn puncture thru Tannus inserts (3/4 of the away from the rim, so not the thickest part) from a hawthorn that would double as a gramophone needle (78 rpm only) .. that was Big Apple rather than MP+, but still Schwalbe and supposedly good puncture protection. Annoying thing with thorn puncture is finding the damn thing .. need a magnifying glass if you don't have a bucket of water, deep puddle, or A1 hearing for the hiss..
Big Apple only have a protection rating of 3 or 4 depending on the guard type:
Big Apple Road Bike Tire - HS 430 | Schwalbe Tires
The Big Apple commuter or e-bike tire started off the Balloonbike trend ten years ago: Comfortable cycling without using complicated technology!
www.schwalbetires.com
Whereas Marathon Plus are a rating of 7:
Marathon Plus Road Bike Tire - HS 440 | Schwalbe Tires
The Marathon Plus is Schwalbe's best selling tire. This flattless e-bike ready tire has low rolling resistance, contains recycled material and our famour anti-aging sidewall.
www.schwalbetires.com
Marathon E-Plus E-Bike Road Tire | Schwalbe Tires North America
The Marathon E-Plus e-bike road tire provides maximum safety on long touring rides with maximum puncture protection.
www.schwalbetires.com
A rating of 3 will not give a lot of protection. Better than a standard tyre, but can still be punctured by long sharp objects. I had a piece of flint go through a Schwalbe City Jet with a rating of 3.