Which sub to buy: JL Audio f113 or Velodyne DD18+?

I've narrowed down my search for my next sub to either the JL Audio Fathom f113 or the Velodyne DD18+. Which one would you recommend, and why? I would really like to hear from people who have listened to both subs.

Factors to consider:
- Mains are currently Legacy Audio Signature IIIs (rated to 20 Hz);
- My next speakers will be Legacy Audio Focus SEs (rated to 18 Hz);
- Room size is 13'x20'x9';
- Listen to 60% music & 40% movies; and
- No set budget.

Thanks in advance.