latin translation: Gratia benedictus vs Benedictus gratiam?

it depends on what you mean to say. Gratia = favour or grace (as in gracious, good looking), but it can also mean good friendship. Gratiam = the same in the accusative, direct object.

benedictus = blessed. It being a adjective, it needs to be in the same case, gender and number as the noun it refers to, and should be benedicta if it refers ot gratia.

So: gratia benedicta would be something like blessed (good) friendship. In Latin you normally put the noun before the adjective.

you would want the gender of benedictus to match that of gratia. so you would write "gratia benedicta" or "gratiam benedictam" (the first one is a subject and the second would be the object. my guess is that you want the first.)