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‘You basically have free hot water’: how Cyprus became a world leader in solar heating
(www.theguardian.com)
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That is also true for solar heaters when there is no sun. and there are not many places that have climates where heat pumps cant operate these days.
Also air source heat pumps can have a COP of 3.5 so or higher. so even with a lower efficiency from the PV you might get ahead. You also get gains from the high COP on cloudy days where you might need resistance heating on the thermal one
I dont think you can claim any of them is better without doing the math.