Maintenance and service calls take the profit out of rental property and can easily put you in the red. Go for least installed cost and greatest reliability. Some renters might quibble about the electric bill. Most will call in the housing cops if they are without hot water for more than a few hours. Some housing authorities can even make you pay a motel bill if your renters go 24 hours without heat, plumbing, or DHW.
Hybrid is hi-tech and therefore high maintenance, gas is a PITA to install and maintain, tankless boards die if lightning strikes within five miles. Resistive DHW has none of these issues as long as you avoid anything with a circuit board.
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