I'd argue that athletes are generally better today than any time before. Sports science, nutrition, and training methods are more advanced. Athletes are therefore faster, more powerful and more agile and generally better, especially when you factor in that there are a broader swath of South Americans, players of African descent and (some) Asians playing in Europe now compared with just Europeans during the Pele/Maradona era.
Which is something Pele didn't take advantage of in the past. Modern day Pele with all the nutrition and training regimes will be less injury prone, stronger, faster, generally even better.
Pele didn't have the advantage of fast balls of today, modern cleats, perfect pitches and so forth. I mean look what Messi said after one of Argentina's defeats:
Messi: “I don't like making excuses but the pitch conditions didn't help us today.”
Compare it to pitches in the 60's and early 70's.
On a side note here's a compilation of how Pele was "handled" at the time.
How much time would Messi and Ronaldo will spend sidelined if the same defensive "methods" were applicable today?
Pele's career was spent in the Spaghetti Western Brazilian league, so its not entirely surprising that an all time great calibre player would spend his entire career running circles around defenders like he was on world class level on Fifa and the opposition were novice. There's simply no comparison between the uber-homogenous Brazilian league of the 50s and 60s, and today's La Liga, which is rammed with good players from many different countries.
Yeah, no. Botafogo team in the 60's boasted with the likes of Garrincha, Didi, Nílton Santos, Gérson, Amarildo, Zagallo, Jairzinho and had most players regulars for the seleção at the time.
Cruzeiro also had some success in the late 60's with Tostão, Dirceu Lopez, Evaldo, Piazza, Natal and beat Pele's Santos 6-2 (a game that is also on Youtube).
Then you had Palmeiras with Ademir da Guia in the late 60's.
Then you can look further in South America with Spencer's and Joya Penarol where also Figueroa played significant part, later in the early 70's captaining a solid Internacional side.
Estudiantes in the late 60's early 70's had a great team.
Pele's Santos also shouldn't be underestimated with Pepe, Coutinho, Zito, Carlos Alberto, Clodoaldo, Gilmar.
I can understand if you are going about the format at the time, but calling Brazillian football Spaghetti league in the 60's is way off the mark. The best players at the time played in South America and Pele faced them time and time coming on top.
And just after that you have him destroying great European sides including Benfica, Real, Barca, Inter, State Reims and basically all top European teams at the time.
Then after all that you have his impeccable international record including a 17 years old Pele completely destroying the best Sweden side of all time and one of the best French side consisting of Kopa and Fontaine.