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I saw a preview/trailer of an anime that had two main protagonists, both the leaders of armies/troops that fight each other in space.
The first protagonist has blonde hair, is a genius in war and is from noble family (maybe). The second protagonist has black hair, is also genius in war and wears a beret or painter's hat.
I saw this trailer recently (maybe from last year?).
That sounds a lot like the OVA series Legend of the Galactic Heroes, particularly the description of the two men. The blond would be Reinhard von Müsel/Lohengramm while the black-haired guy would be Yang Wen Li. It was originally produced in the 80s-90s but is being remade; you likely saw a trailer for the remake.
Official website (in Japanese), if you're interested: http://www.ginei.jp/
