I do not have experience with many of those varieties, but I can tell you that the Keitt is very trouble free, heavy producer, and decent tasting. the only thing Keitt suffers from is its sprawling growth habit. so will require some pruning.
Not really a late season mango the Valencia pride, taste great, and is a very vigorous tree. in our tree in Florida has never been pruned, never fertilized, and never fumigated, and yet its a monster. Id say maybe 25-30 ft tall, and was just 6ft tall when hurricane Wilma hit in 2005. it tipped over and i used a stick to prop it up, I didn't think it would survive. but this year for the first time I didn't get any flowering. If you have the room, why not add a VP also.