Yeah, I can really see that comparison between Lamela and Dele. One has scored 30 league goals in two and a bit seasons and the other has yet to hit double figures and is in his fifth season. I imagine his assist per minutes played is greater too. No comparison at all. Dele has been a difference maker since he first wore a Spurs shirt. The criticisms you can level at him are that he can over complicate things at times and his shooting isn't always as good as it could be, plus he needs to work on his left foot finishing more. But the overall package makes him a top draw player and he'd get in every team in the PL. I think Pep, Mourinho and Conte would find a way to get in their team if they had him. I think Pep would probably oust Augeuro to make room for him and pair him with Jesus like we play him with Kane.
Dele is effectively a second striker, Lamela is more a creative number 10 like Eriksen, one is there to score goals, the other for creativity and team shape. Lamela struggled in his first season but always pressed from the front effectively, more recently up to his injury he was fantastic for us particularly in big games.
Dele offers goals but recently the rest of his play has been very poor but I believe he will learn from it. Eriksen and Lamela (prior to his injury) have become all round players and that is the journey Dele will have to make. Dele will always be a high goal scorer but how he operates otherwise will have to improve and I believe will improve.