I'd take Son all day personally. Lamela does the dirty side of the game better, stronger in the tackle etc, but he can't match Son's attacking ability. It's not even close. Son can beat people, draw penalties, shoot with either foot, get to the byline and cross it. And the biggest advantage is that he doesn't have fake injuries he wants surgery to fix. If the latest reports are true, it's pretty clear Lamela is finished at Spurs.
Fake injury? Then why would the club want him to have surgery????
Can't cross? Can't beat a man?
....Dude, no offense but you suck!