Music apps are still pretty much dominated by iOS. Also some quality games are only available on iOS or are released much later on Android.
While I do think that the "app gap" does indeed exist, I believe only dedicated geeks/musicians/gamers will notice it.
* A good Twitter app for Android (like iOS' Tweetbot or Twitteriffic) * A decent RSS app (like Reeder - slick, w/ Instapaper + Evernote hooks) * A reasonable SSH client (like Prompt, although I haven't looked too hard here)
I'd also miss Office - using Word + Excel out in the field for work (i.e. RF spreadsheets during field surveys) are a huge bonus. Not sure how good Google Sheets is on tablets/Android.
Otherwise, the Nexus 9 + keyboard would be great for travelling and I'm tempted to sell my iPad Mini Retina for one, if not just to experience Android L.