Tranny and Messi find it so easy to score goals (mainly in my opinion because of the way both of their teams and other La Liga teams are set up for them built around them both wouldn't score anywhere near the same in the Premier League) that you have to look/judge them at different standards than other players, and look at their overall play to separate them - and we all know that is Messi's ace in the hole. C.Ronaldo is a great goal scorer - but so was Muller (who was unfortunate he wasn't born in this social media age where goals and stats are considered everything and 4 or 5 different replays after every goal no matter how bang average) his overall play is limited if you judge him purely on the rest of his game during a match he can't dictate the tempo of a game ala Messi or Maradona. Messi also has a bigger reporte of great goals where as you watch one of Tranny's goals you have seem them all (lots of tap ins when was the last time he scored a free kick or great goal?)
They both wouldn't score as many in a team that wasn't built for them to score and get on the end of things - it almost seems like both teams ruin attacks trying to get them to score (when a easier pass would of got a goal for a teammate)
This American style over stats are the be all and end all coming to the European scene irritates me - football debates was never decided about stats and IT IS ruining/sucking the fun of it, sadly. It could destroy football when Messi and Tranny are eventually retired if people continue down the stat path (as people's expectations will rise what a footballer is capable of that a striker scoring a respectable 20 or 30 goals a season will seem average). You have to put it in context.. Gareth Bale would score a bucket load if the Real Madrid team was built around him in the same way as C.Ronaldo in my opinion (probably not as much as Tranny but I hesitant a guess he wouldn't be far off and that will be proven when Tranny retires and Real Madrid buy the next shiny galactico toy)
Like I said, Messi and Ronaldo scoring goals every week is no longer a shock it has turned boring (people no longer care), so you need to look beyond that (overall play or them doing something shocking/extra you don't expect from them like a great goal, dribble, pass, team trophies, achievements etc) to judge them (and decide things like the Ballon d'Or) because goal scoring is too easy for them with the way their current teams are set up. They (especially Ronaldo as Real Madrid are the most expensive assembled team of all time) are very unlikely to ever play for teams that top heavy with talent (it is the teams that don't get enough credit for their goals)
In America - they are small fishes in a massive pond people are not that interested/fascinated by them.