Removing the slide on the P220 is faster than on the 1911 design for me.
However, I find the 1911 design easy to disassemble/assemble: be it the sloppy fit of a GI-Spec 1911 or the tight tolerances of a $2000+ 1911.
I just find the 1911 design to take longer to disassemble.
I have built a few 1911s from bare frames. I have detail stripped the P220, P225 and P226 Sigs.
The P-series is probably 'easier'- if defined as taking less time or attention.
However, I think of 'easy' as effort-related to strain on muscles. Neither will cause any problems there.
Now- as to if this should be an issue, well... Only the purchaser knows their own abilities, interests, and what they are willing to do.
For me, the accuracy, feel, heritage and reliability of the 1911 design make it worth taking 30 seconds longer to remove the slide and reinstall it, when I do a cleaning.
I always think that the simplest to maintain [normal 'field' cleaning- not detail cleaning] is a Revolver, followed by a Glock. The Sig P220 isn't far off from the Glock. The 1911 does involve a few more steps.
But, to quote my grandfather "Are you going to let a little work scare ya?
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Pick the one you want to operate, for the reasons you want, and then deal with the cleaning. It isn't like you will take 4 minutes or more longer to remove the slide and reinstall it [once experienced].
We all have different priorities. Follow yours and pick what is right for YOU- not us.