Against the mangoes I can get my hands on? Most fruit is better.
The best mangoes are the slightly tangy, firm, fibrous ones you can find in Australia. Those are absolutely unbeatable.
Here in NZ all you can find are the sickly sweet, soft, smooth fleshed mangoes which just aren't the same. Might as well buy the tins of Kesar pulp imported from India.
You probably like mango biche. Basically unripe mangoes are exactly as you described. Tart and firm. They only become soft and yellow when they ripen. I have a mango tree in front of my house and the street guys come and pick it clean long before they ripen since mango biche is better than ripe mangoes.