Scisport and a Belgian univercity’s recent studies has shown that messi is twice as good as ronaldo. Their criteria are shots, passes, takles, dribbles. According to sciskill index messi is 1.21 and ronaldo is 0.61. From 2008 to 2017 messi has scored 510 times and assisted 212 ties whereas ronaldo has scored 476 times and assisted 143 times.
But the study do not include UCL. Ronaldo has won UCL 5 times
2007/2008 (Manchester United),
2013/14 (Real Madrid),
2015/16 (Real Madrid),
2016/17 (Real Madrid),
2017/18 (Real Madrid)
While Lionel Messi has won 4 Champions League titles (2006, 2009, 2011, 2015) with FC Barcelona.
So all the studies show one side but can not tell us the clear winner. so let’s just enjoy both of them.