The Spurs play team ball, but I too consider, Duncan and Parker stars and Manu a former star, Not to mention Leonard who is arguably a young star
I would argue that Parker is a borderline star, and that Duncan and Manu are both former stars.
Duncan is still a very productive player, but he does not offer star production these days. No longer is he a guy who can give you 30/15 on any given night. If you get 20/10 from Duncan, then it's a good day.
When it comes to Miami though, Wade and Lebron are both legit stars (both are >20 PPG scorers who can score 30 on any night) while Bosh is a very good semi-star.
There's no doubt that Miami has the greater star power, but they couldn't beat San Antonio's depth and teamwork.
I also don't think Lebron's Cleveland 'super team' will go as well as his Miami one did.
When Lebron went to Miami, Wade was top 5 superstar who had already led the Heat to a title. He already had that killer instinct, the clutch ability, the pure desire to win and the leadership. Lebron on the other hand was the best (or at least, most talented) player on the planet, and had already made multiple Finals appearances. Bosh didn't have that same success, but with two guys as dominant and Lebron and Wade, he only needed to be a nice third wheel.
Now you have the best player in the game (and multiple championship winner) in Lebron, but the other two guys are young players with no history of team success. Kyrie has never really led the Cav's anywhere and has had his mentality questioned (seemingly unable to share the spotlight with other young teammates) while Love has come under a ton of criticism for his inability to ever make a playoff game, and his total lack of leadership skills.
Ultimately though Lebron will run in to the same problem he did the last couple of years in Miami - he, Love and Kyrie will take up approximately $60M in cap space between the three of them. That leaves Cleveland with the need to fill another 10-12 roster spaces with borderline vet minimum players. How far can Lebron carry a bunch of nobody's, and a pair of hyped stars who have never achieved anything?
I think the best match for a team like that is always going to be a team that is stacked with a deep roster, a team like the spurs. Their stars may not be as elite as the ones on the other team, but you can't just focus your defence on three guys either - everybody on the court is a scoring threat. That's a very tough task for any defense.