While the two aircraft have similar range, the Lear 45xr high speed cruises at .79 to .80, the XL at .74 or so. Lear at FL 430/450, Xl at FL 390/410. The XL cabin is much bigger, cross section is reported to be same as the CX, about a falcon 50 width/height. Not so for the lear, it's larger than the CII but no where near the XL. XL has much better field performance. The 45 takes 7 passengers with full fuel, the XL 2 or 3. I think you could fly either with ease.