Which is technically better, which do you like better?
2 of the greatest games of all time for sure. Personally I go with Sonic 1 because in 1991 it was new, fresh, fast, and just damn cool. Super Mario World felt a little too similar to Super Mario Bros. 3 in 1991. Which of course is not a bad thing at all. It's just, it might as well have been called Super Mario Bros. 4, which it was in Japan
Kind of like how Sonic & Knuckles is basically Sonic the Hedgehog 4, still a great game, but the series getting a little long in the tooth. In 1991 that is how I felt about Mario World, I had already played Mario 1-3 and wanted something new, enter Sonic.
I think both games deserve a perfect score though.
I think Mario World is the more difficult game. Longer and more difficult than Sonic 1. Graphically I have to give the nod to Sonic. Gameplay, Sonic, and even music, Sonic. I just overall like Sonic 1 slightly more than SMW.
Of course I guess we are all partial to which game we chose to buy / play in 1991. Anyone lucky enough to have both a Genesis and SNES in 1991 and play both of these games at the same time? I was only 10 in 1991 so could only afford 1 system.
btw, 1991 was 20 years ago already. Damn.
Just checked Wikipedia and Sonic 1 came out exactly 2 months before Mario World in the US. Imagine if Nintendo had released the SNES and Mario World in the US before Sonic, Sonic may have never caught on and became popular.