The Supreme Lord states in the Bhagavad Gita that one who says he is my devotee is not my devotee but one who is devotee of my devotee is my devotee. In other words, serving devotees of Krishna is better than serving Krishna directly.
People in renounced order of life i.e. bhramacharis, vanaprasthas, sannyasis offer direct service to the Lord. However, the Ghristhas work and support those offering direct service. Thus, can we say that Ghristha ashram is higher because they are serving the servants of Lord.
In this sense yes but on the other hand they're closer to maya in the form of money, etc. So every asram has some advantages and some disadvantages.
Btw, it's Grihastha, not Ghristha.