Hi @janoChen:
If you have a choice, go with WP_Query. Both of the other functions (query_posts() and get_posts()) call WP_Query indirectly.
The former is designed to allow you to modify the main query after the standard query has already been run, for example when you want a second loop. But query_posts() affects global variables and can have side-effects. If possible use WP_Query instead and your code will be more robust.
As for get_posts(), it’s just a wrapper around WP_Query with some potentially unexpected defaults so you might as well call WP_Query directly and avoid those issues.
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