My opinion differs from you over here.
87' was the strongest and most in form team that Pak ever had. Their loss in the semi-final was a combination of terrible luck and Aus raising their game & starting their journey to become the best team in the world. The unfortunate incidents included Saleem Yousuf getting hit in the face while keeping and Javed coming in to keep plus a couple of key decisions going against Pakistan at crucial moments.
A neutral article on the semi final ->
Here
The next best is the 99' team. It had everything except the trophy to show for. It was also the last time Pak was a proper contender going into a tournament.
96' comes in at third.
The team that won in 92' wasn't the strongest but the victory was not a one-off fluke. We could at that time beat any team anywhere and went into most matches as contenders if not all. No one would get shocked when Pakistan would win a match or tournament at that time.
People often mention the England rain effected match but forget Pakistan lost the two points in a rain effected match to South Africa. Imran didn't even play all the matches in the tournament, didn't play against Windies or England & Javed was suffering from stomach bug through out the tournament but the team overall was built on contributions of many players and played as a team throughout.