I researched heat-pump water heaters, including asking here, a few years back. At the time, it was a 50/50 mix with many leaning towards the simplicity of standard.
I'm thinking a couple things with your situation, other than the potential for noise: will the tightness of your unit limit its effectiveness/efficiency? Do you still need a drain for these newer units and, if so, where will the condensate go? Are these newer units more reliable/reliable enough to rework your install? (You should be able to replace your current one by yourself, right?)
After we answered some of those questions, we ended up with a standard 50-gallon. With very few exceptions, they're install once every ten years without a glitch. Last night, we took 4 showers in a row and ran a load of laundry and still had hot water.
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