I was wondering about the same thing. If USSE owns a bunch of SSTP and SSTP doesn't own any USSE, then it should follow that USSE's market cap should be higher than that of SSTP. I looked at the charts, comparing USSE's performance to that of SSTP on the same chart, and found to my surprise that SSTP has done even worse, percentage wise, over the last few months than USSE has. Still, if one's way up and the other's way down, it would seem like a logical swap.
The frying pan, or the fire?