There has never been a question about that, they are worlds apart in that department.
Ronaldo is one of the worlds top athletes regardless of sport. He can actually push himself physically in smaller games and "statpad" towards the very end of the season and still get away with it, but Messi obviously can't. We're seeing that now, even with how much he's paced himself in games this season, Messi is starting to look
really burnt out.
His physique in this recent picture after the Valencia game reminds me of how he looked towards the end of the WC last summer, where he started to look too thin and dehydrated all the time. As we saw against PSG, I don't think he has much energy left in him at this point, and for the sake of his health and our season, I really hope is willing to take a break against Getafe next Tuesday.