The smoothness of any given landing is dependent on so many factors that it can't ever boil down to Airline X vs. Airline Y. If you've got a short runway or you need/want to pull off by a certain point on any runway, for example, you're not going to waste a thousand feet of it trying to grease the aircraft on - short, high performance landings tend to be rather abrupt at touchdown. Weather, obviously, plays a huge part in the smoothness of a landing; windshear or random gusts of wind have spoiled many perfect, stabilised approaches with hatchet job touchdowns. Aircraft type is a big factor - the Dash 8-Q400 I fly is notoriously hard to land smoothly while others, like every King Air and the 747 to mention but a few, are very easy to get a nice, smooth touchdown. Even the use of autoland versus manually landing the aircraft plays a big role - the autopilot, as a general rule, tends not to be overly concerned with a graceful arrival. Honestly, I could probably fill the page with the different factors governing the smoothness of a landing.
I always say that as long as the overheads haven't burst open, it's smooth enough!