Based off personal experience and to widen your search, I'd definitely consider the the 1.5tsi over the 1.8. It's a proven engine with plenty of grunt and there's not many more pros to the 1.8 unless you plan on tuning, but in that case you'd be better plumping for the 2.0.
I've had 2 x mk3 Leons, a 2014 1.2TSI and a 2015 2.0TDI, both excellent vehicles with lots of potential. I'd say that the 2014 Leon was probably the best car I ever had. I was sad to see it go.