Giannis is taking 9.2 FT's a game. He is getting to the line slightly less frequently this year then he was last year (at least as a % of total shots). His TS% is also very high because he is shooting an insane 57.9% from 2. He has improved that every single year in the league. Leonard hasn't shot above 53% from 2 since his first 3 seasons in the league.
At the end of the day, I prefer the guy that scores more with a better TS%, rebounds more, and passes more. That just seems like it is a better recipe for winning basketball.