One of the best varieties of mango for preparing mango pickle is kesar mango. Kesar mangoes are preferred for pickling purposes because they possess a sweet, sour taste and firm texture. They have a high pulp content and a lower fiber content, which aids in pickling. Their unique aroma also gives a different flavor to the pickle.
 

Some other varieties that can be used for this are:
 

Alphonso mango: These are sweet and juicy in flavour and also good for making pickles.

Banganapalli mango: These have acidic taste and firm texture but these are meant for pickling.

Totapuri mango: This variety in South India, the Totapuri mango, has a tangy flavour and a fibrous texture which will give good biting when sliced and pickled.
 

Ultimately, the choice of mango variety for making pickles depends on your preference and the flavor profile you want. Use different varieties to suit your taste.