I've spent too much time and money in the last few months on getting my Apple set-up right. I've finally settled on:
1. iMac -- I've been without a desktop Mac for two years. I can't believe I survived! The new retina iMac is fantastic. No regrets.
2. iPad Pro -- Very impressive, but mostly using it as a consumption device. My old iPad Air 2 looks comically small to me now. Bought the Smart Keyboard but sent it back: I can type well enough on the virtual keyboard, and I'm not really using it for content creation so rarely need to type. Bought the Apple Pencil: I'm sure it's great but I hardly use it.
3. MacBook (new retina 12") -- I had hoped the iPad Pro would be my new "laptop" but it just didn't work out for me. I use Microsoft Excel all the time and the iOS version is too cut-down for me and clunky to use. I occasionally use Adobe InDesign and that's not available on iOS. Plus I'm just so used to using a laptop. It's so much easier to type on, especially when I'm half-working and watching tv and it's literally on my lap.
Of the three, for me the iPad Pro is the luxury which it is difficult to justify. Had I not bought it from John Lewis (in the UK) who are bloody awful at taking things back and giving refunds I might have sent it back.
But that's not to say it's not a great piece of kit. I think the iPad and the MacBook are two different things: they have individual strengths and weaknesses. Most people could probably survive with one or the other. As an Apple junkie I've gone for both. The iPad Pro is great for watching movies in bed, much better than the MacBook would be. And sometimes it's nice to interact directly with content via a touch-screen, that being limited to a trackpad.
Oh, I really like the iPad Pro in split-screen mode: that works very nicely when I'm teaching.