While Colonia Vianna is the most appealing place in Mennonite Mexico, it has some downsides. For me, the lack of hospitals is a concern. Another problem is the difficulty of transportation from/to El Paso.
A better place for me may be north of Ciudad Cuauhtemoc. This solves both issues. Ciudad Cuauhtemoc has hospitals and there is bus transportation between Ciudad Cuauhtemoc and El Paso. While this area isn't as nice as Colonia Vianna, it is much more practical for me.