I've owned both....dual JL Audio F110 v2 with CR1; JL Audio F112 v2, dual REL Carbon Limited, and I currently own dual REL G1 mkII subwoofers. I submit like most things in this hobby it comes down to personal preference.
I have owned dual SVS SB15 and SB16 Ultras, HSU, JL Audio, Martin Logan Depth and REL subwoofers. I prefer the REL G1 mkII over every other subwoofer that I've owned. JL Audio subwoofers hit harder, but to my ears, in my room/system, no other subwoofer improved everything across the audio spectrum like REL. You can't hear my G1s when they're on, but turn them off while music is playing and I just shake my head.
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