The M80 is definitely more body-sensitive, but really, it's mostly in the low end. So handling noise is slightly more noticeable in the M80 than it is in the M1A.
The M1A also has more of that very unique "boxy" magnetic sound. So I think that for your applications, the M1A sounds like it would suit you better.
The audio sounds great too! Nice playing.
One last question about the M80 vs the M1a: How is the M80 for fret squeak? Twice the body sensitivity might exaggerate the squeak but the way the body sound frequency response is in a lower range which could possibly make it even less of an issue than with the M1a in spite of the greater sensitivity. Can someone with experience compare fret squeak between the two?
This might be a little more subjective, but I can at least share my thoughts.
Since the M1 and M80 are magnetic pickups, string noise can be more prominent than other types of pickups, by nature. The M1, not having as much body in the signal compared to the M80, should have slightly more string sound in the signal. There is still quite a bit of string response in the M80, but in my experience, the body sensor masks this more than the M1 does.
I personally think that EQ is a much more exact way to remove excessive string and fret noise, when necessary. When I have new strings, or use a pickup that has a lot of "squeak", I usually cut a small amount of 2-3kHz. This typically does the trick, but as always, use your ears to fine-tune the EQ to fit your instrument, pickup, and playing situation.