I guess that's the magic question...what are you planning on doing with the splits? And should we assume that you are having to buy equipment either way?
I started dividing some of my 10-frame deeps into 2 4-frame nuc spaces 'cause I had a number of deeps sitting around. But my bees were staying with me, and I have more deeps to access when the colonies grow.
For the point of discussion, I'm going to assume that you are needing to purchase more equipment. If that is the case, you need to remember that if both halves of the "double nuc" solution survive, then you're still going to need to purchase more deeps (and bottom board and covers and, and, and... :) )
If you buy all nucs, then you're going to need deeps to move them into.
I guess if I had to make this decision, I'd go with the 10-frame deeps knowing that some of the splits, for whatever reason, aren't going to make it, in which case I have a full box at the other half's disposal.
It's way too easy to spend money with this "hobby". If you do have extra equipment, use what you have.