Solar for hot water/heating or better photovoltaic for electricity?

Hello. Our house is to be heated with gas. In order to just comply with the energy saving ordinance, we now have to make a decision soon whether to install a solar system on the roof for hot water and heating support or better a photovoltaic system to produce electricity. What is your opinion on this?

Solar hot water. Everything else is a waste of money. What you spend on photovoltaic costs will not pay off in normal periods.

How large should the photovoltaic system be and what orientation does the roof have?

Solar hot water. Everything else will be a waste of money. What you spend on photovoltaic costs you won't save back in normal periods.

Exactly the opposite.

Photovoltaics will not work. The renewable share must contribute to heating, i.e. with photovoltaics you would have to feed the generated electricity into the heating system via an electric heating element. That is completely uneconomical.
You are left with solar thermal.

How large should the photovoltaic system be and what is the orientation of the roof?

Flat roof with free view (no trees or anything) to the south and west

Path of least resistance Alibisolar i.e. 5sqm solar thermal with storage in the HAR.

Otherwise large photovoltaic but as Alex already wrote the renewable share might still be too small. Then there are various bizarre constellations.

With more insulation + controlled residential ventilation with heat recovery it might also be possible. Everything has to be calculated.