I don't know what the current version of PSE is like, but when I was looking a few years ago the differences that sold me on PSCS6 over elements were mostly related to actions and styles. On elements you couldn't write your own actions, using purchased styles was more cumbersome, and there were fewer styles available that would work with PSE. I don't know if that would be enough to sway me to PS when the options were a single cost for PSE vs a subscription for PS, but I use multiple styles on every layout and sometimes write actions so that's probably where I'd feel the difference most.
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