Lamar:
59 passing TDs and 12 rushing TDs in his last 39 games (3 seasons). Total TD ratio of 1.8 per game
7881 yards passing (202 yards per game) and 2536 rushing yards (65 yards per game) 267 total yards per game
Josh:
108 Passing Tds and 21 Rushing TDs in his last 49 games (3 seasons) Total TD ratio of 2.6 per game
13,234 passing yards (270 yards per game) and 1946 rushing yards (39 yards per game) 309 total yards per game
Over 17 game season that's a difference of 714 total yards and 13.6 Tds
All that said, Lamar has plenty of shortcomings and I don't think he is the same level of player as JA or Mahommes, or Burrow even, but he is a good player and should get a very lucrative contract