Ohey a Focus post!
Oh man, I wish I hadn't missed this when it first was posted. My brother has a '15 SE he dailies and the thing is pretty solid and reliable. I have an '18 ST I daily and I'm beyond happy with the decision I made. The only persistent issue with the pre-facelifts (2014 on back) is the lower lip of the back hatch rotting out due to the drain holes not being low enough. Stay away from the SEL and Titanium trim levels because they eat gearboxes like it is nobody's business.
The S-line I have never ever seen in person. They weren't exactly the most popular around here just because they were a manual married to the lowest tier engine. The common consumers got the SE, the ones with a little more spending money got the SEL, Titanium (with their garbage gearboxes. Shame on Ford's part), and the people who actively wanted manuals just got the ST/RS because they had the 2.0/2.3 turbo engines.
I'd recommend the SE/ST wholeheartedly, I have no bid on the S with it being so rare, the RS used to be problematic with the head gaskets, and the SEL/Titanium are just wallet time-bombs.