Martinelli's xG was 9.21 in the PL last season and he scored 8, so a goal less than he should have based on the chances he had.
Rodrygo got 6 goals and Leao got 9 last year in the league - weaker leagues IMO.
Rodrygo has never got close to the levels Martinelli did in his best season and Leao matched it in one season.
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Comparisons above on attacking play.
Given that Martinelli is operating in the PL I think he looks better - and then there is also the job he does running the line and helping the defence, which is far more than either Leao or Rodrygo do - and important to us.