which subwofer is better?

Its really hard to give you advice without knowing what type of speakers you have. I use the Fll0 because it could keep up with my electrostatic speakers. Good Luck.

Fronts r CRS-3(250 w RMS),center CRW-3C(250W RMS) and two backs CRM-2BIP(250W RMS),all Sunfires

I also believe all the above subs would work great with your system. I would also like to mention that the JLF112 is another sub you should consider. I personally like it better than the F113. Good Luck.

Never heard the REL. I'm a dealer for JL, and Velodyne. Both are outstanding. You can't go wrong with either of them.

They're both better. The JL line is generally a bit tighter and a bit more defined than the old DD Velodyne.

I had a 113 on loan for a few weeks and I owned the DD18. My main speakers are Avalon Acoustics Eidolons. Using their internal EQ I never got the JL to blend with my room and speakers. Its speed and definition always drew attention. Using the Velodyne EQ on the JL helped but it just wasn't a match. Even so the JL is a beautiful well made sub.

I've since moved on to a pair of Velodyne DD-12plus which have been substantially redesigned over the original DD series.