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The 2.0 feels like sand paper in your hand and has a better trigger but for $300 it's not that much of a better trigger.
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Agreed, yet it also brings an extended metal chassis almost all the way to the tip of the frame, for added strength.
The serrations at the end of the slide, meh, more a "cool" factor than anything else imho.
Altogether, worth $300 additional bucks? Probably not. But the 1.0 M&P prices dropped down as well, so the price differential has been increasing compared to the period the 2.0 was introduced on the market.
And to get rid of the trigger "issue" on the 1.0, one solution is to get an APEX trigger, which adds $150 or so.
Or DYI for instance: https://gundigest.com/how-to/gunsmithing/shooting_smith-wesson-mp
Up to you and your budget I guess.