I think they both would be great speakers. Can you audition either of them? The only way to tell would be to listen to both brands make up your own mind.
My local high end dealer carries Triangle but I haven't listened to them only looked at them. They both are great looking speakers as well and the Usher 6371 in gloss black with the wood accents would be my choice based just on looks. Though sound is the thing you're after so if possible try to hear them if you can. Both companies seem to have gotten great reviews for their products.