After the Sangakkara Pietersen debacle I thought would be interesting to compare Sanga to Chanderpaul, who is probably underrated more than Sanga.
This is a comparison which I feel is realistic and 50/50. Sanga does possess the better average, but Shiv started at a time when bowling attacks were better and pitches were harder to bat on, and he's had to suffer in a fragile batting lineup. He's performed against nearly all opposition in nearly all conditions except in Australia and Pakistan, but even there he has some impressive knocks against some all time great bowlers (Mcgrath, Warne, Wasim and Waqar).
Chanderpaul's abilility to play the ball as late as possible and use of his wrists mean that he is arguably a better player of spin than Sangakkara who is also wristy but does not seem to have as much give as Chanderpaul. I would also give Chanderpaul the edge in terms of playing swing as well, he is great at committing to the shot at the last second. Where I would give Sanga the advantage is playing the bouncing ball, Chanderpaul definitely doesn't play it as well as Sanga either defensively or offensively.
Utimately I can't choose between these 2; Sanga bats in the top 3 and is the slightly heavier runscorer, but I can't think of a batsman in world cricket that has bailed their side out of trouble more than Chanderpaul.