No real comparison
Seneca:
One battery + two generators + external power connector (DC)
ATR:
Two batteries (main + emergency),
Two engine driven DC starter/generators,
Two static inverters (supplied by DC system) each supplying Constant Frequency AC power at two voltages,
Two engine driven AC Wild frequency generators,
Two external power connectors (DC and AC)
Two separate networks (1(left) and 2(right)) run serarately but can be connected through Bus Tie Contactors.