For me, it boils down to what sounds better to YOU. Features are one thing, but have a bass inversion capability on a keyboard that doesn’t inspire you isn’t going to help…

And as inexpensive as lithium ion battery inverters are becoming, saddling yourself with a less than satisfactory keyboard just because you can run it off of batteries isn’t that important any more.

You are likely to get the most value out of something that blows you away sonically AND has the features you want. You are likely to use it for years, which is unlikely if you get something lesser. You’ll be selling that (at a considerable loss) the first chance you get to overcome its problems.. The cheapest solution in the long run is to pay a bit more in the short run!