Maybe its an unpopular opinion, but i think Ronaldo was closer to Messi when he was in his prime than he is now.
Ronaldo had more variety to his game than now, he was a monster at the counter attack, a big threat in the box(still is), and he also had a wicked long shot, there was no "setting up" against him, you just had to prey he had a bad day.
Now? Of course he it still as difficult to contain in the box as anyone, world class at that, but he doesnt have as many strings to play on anymore, so its easier to neutralize him imo.