Ronaldo's goal was just brillant. His finishing is simply perfection. That bicycle kick was incredibly hard. The height, the angle, is own movenment against the direction he wanted to shoot.. amazing. It's like he's a robot that sees the ball, calculates its distance, curve, pace and precisely knows when to jump and kick in order to hit it perfectly. And he's already 33. At that age, most other players would have broken their backs or something like that. Except for Ibrahimovic, probably.
I think if a player like Crouch scores 3000 goals he needs incredible provision of goal scoring opportunities because he doesn't create them himself. I get your point because obviously you need incredible abilities (especially awareness, anticipation and intelligence) in order to position yourself correctly and an amazing technique in order to finish your chances (and probably athleticism too). But in the end, you are totally reliant on your colleagues. Ronaldo cannot really create chances out of the midflield. Or, let's put it that way: He is nothing special in it anymore and even the Manchester United Cristiano, albeit a brillant creator, was not on Messi's level. For instance, if the midfield engine of Madrid isn't working, Ronaldo won't fall back, take the ball, dribble past an opponent, play a little bit one-two with the forward and then finish it himself or assist a team mate. He simply doesn't do that. He at least needs a cross to come in the box (even if it is bad, just like today) or a pass he can run into. For me, that is the difference.
It is really a question of preferrences. Which quality of a player do you rate as the most important personally? If you say it's the abilities Ronaldo exceeds in (positioning, finishing, "guts" etc.) than that is fair. But you should use these criteria on every player. Because historically, other attributes have been used in order to identify the greatest players.
And personally, I stick with the other attributes. I admire Ronaldo, he is the best player in the box I have ever seen, but put him exemplarily in a side like Barcelona at the beginning of this season and I don't think that you will see much of him. Messi can drop into the midfield to initiate attacks if you need him to. In fact, this is what he does most of the time in the last two seasons and for Argentina in general. It is amazing that he still ends up on the scoring sheet that often. You cannot bother Ronaldo with the same things. Of course you could neither ask Messi to go into the box to fight with the center backs and score after a cross but I simply feel like Messi contributes more to the success of his teams with the things he does although it cannot be measured in goals. Put him in front of a midfield like Kroos and Modric or Iniesta and Xavi and he scores even more than Cristiano.
Probably you could put it that way: The Cristiano of the past five years (and this is the one that won three of his four Ballon D'Ors and thus the player that shaped his legacy) is close to nothing without provision. But if Messi is not provided with scoring opportunities, he simply creates them on his own and miracously still ends up at the end of them. That makes him more versatile for me. Because he steps in if there's a creative vacuum but also when the team doesn't score enough goals.
Please don't understand that as criticism of Cristiano. As I said, I think he is an incredible player and deserves to be mentioned among the all-time best although he maintains a totally different playing style since he is so good at it. However, when we are talking about the spheres I see Messi in (which is at Maradona and Pele level) then this stain keeps him out if you ask me.