I’d rather be/have a sunny cold day, though I suppose it depends on how cloudy the cloudy day is. I’m assuming you meant overcast, not just partially cloudy? Also I answered as if the days would happen during appropriate seasons — nobody is going to be disappointed by a sunny day in winter still being cold. Cold is the baseline in winter, and this day happens to have a bright blue sky and maybe some sparkling frost on top of that. I’d be less in favour of a sunny cold day in July.