I've heard all these speakers many times in many systems. IMHO, the Aerial had the best balance of them. The Alon has nice mids & highs, a very big & deep soundstage(especiallly for a larger box), and is tube friendly(granted, you need a fairly beefy amp). Downside of the IV is boomy, slow bass, bettered by the V or the lower-priced II.
The B&W's strengths are it's lively dynamics and deep bass, especially when driven by hearty ss amps such as a Krell, BAT or McCormack. The highs on the B&W are too sterile, and dry sounding to me, making the system call too much attention to itself. An example of "too hi-fi", not enough music.
The Aerial is a nice balance between the 2. Deep, tight bass, but not as strong as the 801. Nice soundstage, though not as wide nor deep as the Alon IV. Natural timbre, a slightly warm balance, but not extremely.
I believe there are different iterations of the 10T with varying tweeters, later the better. Can't say the robot-like looks appeal to many. The Alon's call much less attention to themselves.
The Alon V's (higher priced, and not sold in as great a number), are a serious contender that I think beats any of these 3 hands down. Regardless of which you choose, be sure to get them a few feet away from the back & side walls or you'll get far from their best. Cheers, Spencer