I honestly think Sakura, Chouji, Lee and Neji are interchangable depending on scenario. They have different advantages and disadvantages depending on the duty.
Lee is a taijutsu master, fast, strong, has good reflexes and awareness. He is quite endurant and has perservance, not to mention gates and decent weapon usage. He is not particularly intelligent but not dumb as many think.
Neji is another taijutsu master, fast, has good reflexes, intellect, has byakugan insight and sensor. Also gentle fist is a one-hit K.O regardless of durabilty and has an ultimate defense.
Sakura has more support abilities than any of them, she is intellect, medic, can utilize poisoned weaponary, has super human strength and boss summon. Her speed and taijutsu are not good like 2 above but not So bad either.
Chouji is probably the less versatile one but he can just stomp on people like ants. He has good deal of strength, butterfly mode, handle some blunt damage due to sheer size.
^^^^I think these 4 are the strongest ones among them. Rest, especially Ino, Tenten and Hinata are not coming close. Dunno how people still compare Hinata to Sakura.