My tenant wants me to put in artificial turf in the backyard

[Joshua Dombal]

My house was just built in Phoenix AZ, the yard is currently dirt.

My tenant is wanting me to put in a patch of artificial turf so her kids can play and what not.

I know of other landlords in AZ who will put rock back there.

The rock is about $1,100; the rock + turf combo is $3,100. 

Does anyone have advice here on what I should do?

Is there any reason for me to do the rock + turf combo?