To me? From the top of my head: a Session View that is beyond the scope of LPX Live Loops (f.e, follow actions, etc). It has Max for Live, which opens a universe of possibilities. The Racks. A faster browser. The deep integration with hardware, specially my Push 2. Live feels like a sleek, consistent, solid (LPX is buggy and unstable) and mature DAW. But more importantly: the workflow is quicker and simpler, and I feel creative with it, for the music I make. YMMV, of course...
I still have Logic Pro X installed and I use it from time to time, mainly for comping and mixing (and I love toying with the new step sequencer!). What's better than using both Live 10 and Logic Pro X? It's a great combo. If Ableton added easy comping and a dedicated mixer window, I don't think I'll ever leave Live. But it's not a huge deal, as Live still can do those, just not as easy.