Not in any specific order but I know the top three teams I run into are Rockets, Warriors and Clippers easily. I know the Cavs are on this list too but I use the Cavs quite a bit myself so I don't run into them as much because I am using them.
I think a lot has to due with injuries too. No one was using the Cavs when Lebron was injured and no one is using the Rockets while Howard is out (except for the few die hards lol).
Top teams used are Rockets, Warriors, Clippers and Cavs. I almost have to throw the Bulls in there especially now that Noah is back.
Honorable mention to the Thunder, Blazers and Wizards.