Very different sound.You should find them and even at different stores take a listen.ZThink 803 will have more weight and authority Triangle is faster and mayube a bit more pitch accurate.Neither of them go deep enough to play Qrgan fndumentals but will with a good fast servo sub would be verything you needed.But both will p;lay within 2 or 3 db of the low note on an elctraic bass so don't NEED a sub.The Triangle will not need near the power the b&W will-the 803 might be 90db sensitive but goes very low io impedance dips so you need 200 better 300 watts.You should go take a listen.Why not Cabasse or JM Labs from France?Make great speakers in your country as well.
Adieu
Chazz
Adieu
Chazz