Tough to say, I think you can argue for it both ways.
Lendl tried to become everything he was not in order to Wimbledon. That is true dedication in an attempt to win one title, especially since surfaces were different back than. Then you have to add in how there were many great grass players back then, so it was a real mountain for Lendl to climb in his attempt to win Wimbledon. You can say that with all that effort, and all that sacrifice, he should deserve one.
Djokovic, on the other hand, benefits from surfaces being less polar so he should be able to easily win one since it's conducive to his game. However, you could also say that it is a real pity that he can't win the FO even when the game is geared toward his favor. That, and barring his mini decline in '09 and '10, only Nadal and Federer stopped him. I think it speaks a lot when you can say the only people to stop him were an all time great and the greatest clay court player ever.
If you look at their losses, it's pretty similar. Becker seemed to be Lendls verison of Nadal, the guy who was always stopping him. Lendls 1983 loss was like Djokovics 2013 loss where all you had to do was make the final. Pat Cash was like Federer in 2011 where he ruined Lendls best ever chance to win in terms of form and competition.
I think the whole surface homogenization gets cancelled out by the fact that Djokovic faces the clay GOAT pretty much every time. Roland Garros hasn't changed since forever, so regardless of what the rest of the tour is like, RG surface is still the same every year. You can say that there was a polar switch from clay to grass, but there was a time where Lendl sacked the clay season to practice solely on grass which takes the clay to grass switch out of the equation. However, you might say that Lendl was out of his prime at that point, which is quite possible.
Personally, I think Djokovic is more deserving. One, because Nadal has denied him the at the highest of stages (SF's and F's). Becker/Edberg on grass =/= Nadal on Clay. As great as those two are, I don't think anyone would say they were best on the surface like Nadal is on clay. Two, which to me is the kicker, is that Djokovic has won on, what many consider, his worst surface, twice. You're telling me he can't win on one of his best surfaces, yet he can win twice on his weakest? That's depressing.