Looking for the best typography for equation & formula input

Hello Everyone,

I represent a small University Press based on Mexico, we are about to start a textbook series for K-8 and highschool levels so we're consulting the professionals about the best-suited typography for equations & formula input. The one with all the bells and whistles.
We hope you can help us with some suggestions.

Our considerations so far are:
Freda Serif A
Le Monde Livre

Thanks in Advance for your help.
All best.

Luis Sánchez
+52 (33) 3640-4594
Comunicación y Diseño
Editorial Universitaria
Universidad de Guadalajara