I knew exactly what you meant and it's not surprising that several others are in an uproar over your statement. The ipad can do many things but for certain things, you NEED a computer. With the rMB, you can accomplish everything and never NEED an ipad. Sure some people prefer content consumption or certain tasks through the ipad touch interface or through apps vs. browsers, but all ipad tasks can be accomplished on a MacBook. However, all computer tasks cannot be accomplished on an ipad. Of course having both products is ideal but the rMB truly can replace any NEED for an ipad due to its size, weight, and overall portability.
I'm not arguing one way or the other but that analogy isn't accurate on any level. A MacBook can't be folded flat to use the screen only, which is the physical definition of a tablet while the iPad can do most computer tasks. So the iPad is a better computer than the MacBook is a tablet.
[doublepost=1486570599][/doublepost]Back to the OP's question. Apple has a generous return policy, buy the iPad Pro and use it for two weeks. If it combined with your old laptop doesn't work, return it and get the MacBook.