L. It has a shorter headtube. You will naturally raise the seatpost to the correct saddle height on either bike, but the bars don't come up quite as easily.

That said, you can install a positive stem with spacers on the L and negative stem without spacers on the XL and have the same bar height.

However... I think more likely you will be running spacers and positive stem on the XL, and looking for a 17+ deg stem on the L. I haven't fit you, I just see how these threads go.