That's copy. Not cut. Cut is ctrl+x
Copy + move. It's the same effect. Calling it something different doesn't mean OSX can't cut and paste files.
OP: I... can't really recommend either of those. The dell is massively overpriced for the casing and lack of a reasonably-sided SSD. The mac is heavy and lacks a GPU, and it seems like that matters to you -- the Iris Pro does not have close to the real-world gaming performance of even marginal discrete graphics, no matter what any skewed benchmarks tell you. Pretty comparable to the 750 for stuff like video editing though.
Macbook edges out the Dell because it won't lose 50% of its value in the first three months of ownership.