I was so impressed by Bitwig since the beta. Just couldn't find anything major enough to make the switch from Live. Also, M4L is such an amazing ecosystem, I would miss it.

Any features in more recent Bitwig versions that stand out?

I’m not sure how recently they were added, but the Grid (modular environment) and the modulation sources are really powerful, particularly for adding organic/generative elements to a production. I’ve heard that Bitwig routing is another workflow enhancement, but haven’t used it too extensively.

It would be cool if Bitwig would introduce a scripting environment similar to Max for Live.

If Bitwig would add user-modules to the Grid, along with a scripting language, it would be perfect.

Where they both fall down is in less capability for the piano roll and midi for more complex compositions and styles (orchestration) and although Live has made some moves towards improving that recently, they're both still way behind in that area.

Totally agree regarding the piano roll. Same with the sample editor.

Saying that, DAWs just have different specialization. E.g. for a long time midi support in ProTools was extremely limited. Cakewalk already had an excellent piano roll in the late 90s.