Not so much because it's IMC but generally when the weather is rubbish that means rain. A wet runway gives you worse performance than a dry runway.
25 has a hill which is considered in perf. calculations but 07 doesn't. 07 is generally better performance wise and quite often it's better to take 07 with a tailwind when it's wet.
That's my best guess as there aren't really any other differences between the two.