Yes mango preference could be very subjective. I recently tried Coconut Cream, yes it smells good etc, at the end I'm glad I grow NDM. Here is why:
I'm looking for mango that I'm not only can eat fresh. I want a mango that perform well in dessert, whether is mango mousse, mango pudding, mango lassi, dehydrated mango, freeze dried mango etc. I think a lot of the complex flavor like Coconut cream will be lost in dessert. If you make a mango cake with Coconut Cream, and a mango cake with NDM, chances is many people would think the cake made with NDM taste like mango cake while the one made with CC would taste like mango with something else, hence throw people off as mango dessert.
The nice thing about NDM is it can be used to make Thai mango salad, so there could be some "commercial" benefit if you can sell it in your neighborhood area. I still like to eat other mango with complex flavor, but if I keep eating Coconut Cream for 2 weeks in a row, I'm going to get sick of it, so when choosing mango to grow, at the end of the day you need to consider the application of the mango once you start harvest hundred of mango off the tree in a couple years.