Hi Pete,
No questions about it, I'd rather be packing 2xSunray's for WA shooting. If you take the backscatter tests as a baseline there is a 20% ish difference in lumen count between the two (777 vs 980), but in real life the punch/intensity/throw (call it what you will) of the Sunray was more than 20% better in my view. The Sunray turned my kitchen into a tanning salon, the Fisheye was just really bright.
The light coming out of the Fisheye is extremely cold, so I felt the need to put the diffusers on. Sadly this eats a half to one full stop of light (based on my above water tests) which for WA shooting and the limited power lights we're talking about is a fair bit off the top. The light from the Sunray a little warmer though I’d throw on filters if I had them.
Build quality is definitely higher with the Sunray being of solid alloy construction, though that said the Fisheye isn't bad either. I mentioned it elsewhere but I also prefer the lightweight head on the loc-line over the more battery/head config of the Fisheye et al. I just didn’t find that 3/4" loc-line was grippy enough to hold the fisheye's weight. This was a big issue on land and an annoyance underwater.
Beam angle between the two was comparable (from memory), but the smaller head on Sunray allowed me to put about 20” of loc-line on get the light head further away, thus more angle.
Both have proprietary batteries that are expensive to replace and custom chargers, though this is par for the course on any decent light I’ve seen.
The Sunray's issue is the battery size/weight, but if you have them mounted nicely (perhaps with the L&M rail adapter) you could manage it well. Weight at the bottom of a DSLR housing could only help stabilisation also I’d think.
For me it's the difference between a dedicated video light and a great modelling light stretched to video work.