Honda 3kw at full load vs 7kw at 1/2 load, which is quieter?

The eu7000is replaced the eu6500is. It uses fuel injection, so I assume there won't be any propane conversions for this one. I was skeptical about parallel operation because the twin inverters are wired in parallel for 120-only operation, and in series for 120/240 operation. But there is a parallel kit. It uses 3 wires instead of 2 as in the 120 volt only generators, and unlike with the 120 volt generators, it does matter which wire connects to which jack. The parallel plug contains all 3 wires and is keyed.