Both will turn out nice ammo, you just have to decide if you want to ever use a hydro or electric drive in the future. RCBS has free lifetime parts, which is nice but there can/will be delays in getting them at times. A friend of mine has the RCBS machine and has been waiting on parts for over 6 weeks now. He has called 3 times and gets a different answer each time, the last time he was told they make the parts up in small batches as needed. Other times in the past he's received them in a week to ten days. You have to pay for MEC parts but at least you can get them from multiple sources any time you need them! Have owned the RCBS Grand, numerous MECs plus a 366 Hornady and a PW 800+ and if I were buying a loader today I'd go for the 366 or PW and skip the Grand and the MEC.
