I'm going to leap to a conclusion, and that is that you are planting sunflowers for dove attraction. If that is the case, the no till option would not be the best option. Dove feed on bare ground. Leaving residue via no till may make your plot unattractive to dove. Doing the conventional tillage and using herbicide to keep the grass out will provide that bare ground feeding platform that they seek. If this is for ag production, then, yes, it would work fine.