Really just depends on what amp you want. One isn't better than the other. Although for SPL high powered applications, Dual 1 may be the way to go because you can drop it to .5 ohms.
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MECP Certified.
Alarm: Viper 5200
HU: Stock
Active Set-Up
Tweets: Image Dyamics CD1pro mini horns
Mids: Sundown Neo Pro 8s
Amp: Kicker IX500.4 (2)
Sub Stage
Subs: (2) Dayton Audio 15" HF
Amp: Kicker IX1000.1