Well from a team captain who has guys that run both woofers, I can give you some direct comparssion nummbers.
First for the sound of the two woofers. Woofers and there sound reproduction, have to do a lot more with the enclosure you build for them, and the power put to them. I can make **** sound marvelous, so we wont go into that discussion.
As far as output(purely spl) I have seen both in action, tested both, For purely spl output. 2 10s with 4k 58-60hz range the AQHd3A coils out performed the RD Heavyweight 10s by 3db 155db to 152 WOW. Both woofers definetly come to life with more power.
I have also heard both, thats a toss up, what do you like, for or chevy. I know the aq for response handled everthing very nicely. The Rd didnt like the extreme lows. again. I could have built another box to get them to respond better.
The last mistake any of you want to do is underestimate the AQ woofer, its a sleeper. and until now isnt being used widely in spl. Has it been used before yes, but this yr will be an eye opener. RD had very good equipment as well. Customer service could be a little better. But Steve Is trying to get his company off the ground. AQ for all I talk to Is top notch on top of there game in every aspect of their buisness.
So remember do your own homework, dont depend on what others have to say to you.