Kermit, I know you asked Venom, but I'm bored so I'll offer my opinion, which is is those are both excellent value subs, I'd personally lean to the SVS on spec. For a couple of hundred more you'd get a bit better accuracy and extension going to a Rythmik, which is where I'd personally go if I were buying today. And yes you'll get an appreciable benefit with any of them.
Current Gear: Anthem AVM60, D-Sonic 3500/7, Oppo UDP-203, PS Audio Nuwave Phono Pre, Technics SL1210 w/ Denon DL103, Dune Duo 4K, LG Oled55e6, Paradigm Sig. S6 & C3 v.3's, Monitor ADP's, Velodyne SPLR1200.