Peter, if by "bigger" you're referring to wide dispersion, the W T/M W design of the VP-160 is superior in that respect. If you're referring to the very loudest sound level, the VP-180 would have a slightly higher maximum, but keep in mind that the center speaker should be calibrated to balance the others, not play louder. If the VP-160 already does this, more maximum loudness capability isn't a relevant factor.
Good point about "bigger". What I meant by "bigger" was soundstage and bass output. I guess to be more specific, I want to know what is better about the VP-180, not in terms of specs, but for those who have heard it, what do they best about the VP-180 compared to the VP-160. This will perhaps help me the most make up my mind.
