If most of the soils you will farm are not very rocky I would choose a roto tiller. That harrow will take a lot of work on new ground since it is so light, but in rocky soils would be a much better choice. It will do it, but if you have the $$, I would get the tiller if rocks aren't an issue. Your tractor will handle the harrow just fine. If you choose the harrow, you can adjust the top link on the first pass, so that the front gang will be digging much deeper than the rear gang, that is angling the harrow into the ground as you travel forward. The rear gang will act as weight for the front gang. The harrow will be an 'all soil' ground engaging attachment, where the tiller will get beat up on rocky soils.