As others have said, you are comparing apples and oranges. Macbook is a traditional non-touch laptop. SP3 is a hybrid device that's primarily a tablet. If you are going to be using the device as a laptop 90% of the time, then SP3 doesn't make sense. If you are going to be using it as a tablet most of the time, then Macbook is not an option.
As far as Core M, Anandtech did an excellent review on performance, and the findings might surprise you - the CPU is very close to i5, while GPU runs out of headroom faster - for games, etc. Core M might be an issue, for productivity (or video), there really isn't much difference. Here's the link to the review (Yoga 3 Pro):
AnandTech | Lenovo Yoga 3 Pro Review: Refreshed With Faster Core M