I used the raspberry leaf tea tablets. I went to our local health food store at about 38 weeks to buy the tea and i was told by the ladies in the store that tablets are more effective, you take one morning and evening whereas with the drink you'd have to have at least 8 cups a day to have the same effect.
I then questioned if it was worth buying them as it was $20 a bottle and i was so close to the end anyway but they also said it's good to take after birth as it helps the uterus contract back down.

I have no info or experience in the vbac side of things. Good luck though