In the past I used both the 13w6v2 and the 13w7. I found the 13w6v2 to perform better sealed whereas the 13w7 performed better ported. My issue with the 13w6v2 was that it unloaded easily in a ported enclosure on 570 watts RMS whereas the 13w7 didn't seem like it was at its mechanical limits with just over 1,000 watts RMS going to it.
Oddly, the 13w6v2 was much happier with 850 watts RMS in the sealed stealthbox. While I could drive it to its mechanical limits, it took a lot to get to that point sealed whereas ported it was way too easy to push the sub into its mechanical limits.