Hi,
I have pretty extensive experience with Domainsponsor and Skenzo landers. Specific traffic will do better on one or the other. You can use Trafficclub to do a head-to-head comparison of the two as they are both offered there. Just set your defaults to 50% domainsponsor, 50% skenzo for each domain until you see a pattern.
The Skenzo lander looks more like a real website. I have concluded that this lander has better click through with "experienced" traffic...people who use the internet often.
The DomainSponsor lander looks more like a subject search page and seems to do better with less experienced traffic...people who just type things into the browser bar as if it were a search engine. These people don't really know what they are looking for and don't get turned off by a parked page.
So good generic keywords, go with Domainsponsor. Typos and myspace/youtube/etc. type traffic, go with Skenzo.