all depends on how a field is going to be used. If it's basically a game field only - no practice, etc - then a grass field can hold up pretty well. but if you're playing varsity, JV, Junior High, Boys Soccer, Girls Soccer and so forth, then a grass field will get beat up - especially if you have a couple of "rain" games.
in Windom, where I live, the School Board is floating a proposal for a new sports complex - in order to move the games away from the river that keeps flooding. the plan would have a multi-use turf field, plus new baseball and softball fields next to the high school, re-doing the HS track and field complex, along with renovations to the locker rooms, a new wrestling practice area, and a new performing arts facility. estimated price tag is $33-million. the "Ag2School" tax credit will lower the net cost, but it's still a big number for a smaller community. (4,800 people). they are applying for grants, hoping to get some FEMA money - and - no joke - offering 'naming rights' for donors. So if you want a football field named after you and can write a check for 7-figures, contact the Windom School District.