Tankless- expensive, high maintenance, high failure rates, high install costs, limited flow rates, poor winter performance, long payback.
Hybrid Electric- too tall, need surrounding space for heat exchange, poor durability, noisy, may need condensate pump.
Solar- requires southern exposure, cold & cloudy days: poor performance, very long payback, high install costs
The good old Storage Tank water heater- electric is OK, fast payback for gas or propane fueled(if low fuel price). Easy to maintain. Best to purchase long warranty unit for maximum durability.
How can this be? The best available technology at a reasonable cost will always prevail. And it has to, in a word, JUST WORK! With the exception, sometimes, of federal government mandated technology, (and dehumidifiers)!