edit: but i used a different os, which could explain that too.
This may be true for your experience with X1Cs, but it's hardly true for Lenovos in general. My t450s rarely makes any fan noise under stress, and it's never become uncomfortably hot to the touch like my work MBP has.
This may be true for your experience with X1Cs, but it's hardly true for Lenovos in general. My t450s rarely makes any fan noise under stress, and it's never become uncomfortably hot to the touch like my work MBP has. My work MBP also definitely gets very noisy if I'm pegging a core or three.
And of course, if you need OSX for work then only MBP provides that.
In my opinion, t430u is the second-best laptop I've owned, but the Macbook blows it away, even in terms of build quality.