Another consideration, IMHO, is complexity and repair cost. Unless you're somebody like 7A749 or Duane, if your Dynasty quits, you're probably not going to be able to fix it yourself. With a Sync, you might, with some help from the folks here. The Dynasty has a lot more computer boards than the Sync, which can cost $$$$$ to replace or have repaired. The Syncs have been around since about 1978, so they have a much longer track record than the Dynasty and other inverters. Also, if you plan to weld much aluminum, there's a big difference in duty cycle between the Dynasty 200 and the Sync 250. At 200A output, the Dynasty 200 duty cycle is only 20% where with the Sync 250, it's 60%. And going to a bigger Dynasty is going to cost $$$$. Unless I was in a production environment with people welding all day, every day, the difference in power consumption would be my last consideration. YMMV.