MAJORS OR MINORS
There is a general feeling that one should lead majors rather than minors against no-trump.
And this is true, if you accompany the above statement with the caveat ‘All things being equal’.
The logic is that the opponents will play a major, if they have a real fit there more often than not, but won’t necessarily do the same with a minor fit. But it is only a tie-breaker rule, not a way of life.