From my experience, Seedling trees adapt much better to various soil conditions, possibly because they will have a long undisturbed tap root. If you want to save yourself some time, you can plant a Lavern Manilla Mango from Home Depot. It has proven to be a good grower here in SoCal as long as you have decent soil and get it into the ground before it gets severely pot bound. The issue with this Manilla Mango is that the Fruit is poor quality. That means that you will need to top work the tree with named varieties if you want good quality fruit.
Unfortunately, grafting causes issues here in SoCal. Once a tree is grafted with mature scion, it will likely flower in its first or second Winter. Flowering on a small tree is a huge waste of the young trees resources and will delay vegetative growth and establishment of the canopy.
I suggested planting polyembryonic seeds because in theory, if you get multiple sprouts, you may get lucky and get a clone so you will not have to graft. Also, because it is a seedling tree and thus it is not grafted, it does not get stimulated to flower and you should have several years of vegetative growth and establishment before it reaches sexual maturity.
Simon