Steve Cambell I can't answer your question about "white gas," being used in the Taurus, but I can tell you this from from my own personel experience with with the two engines you mentioned. The Taurus 3.2, and the DA 50.
Even though this subject has been debated for many months now, I know this will get it going again. You ask the "Forum a question, and I think you're intitled to our opinion as long as we keep it on "Subject.
Your question was directed toward two specific engines, The DA, 50 and the Taurus, 3.2. But, I'll bet every other engine make will be brought into the equasion. So...,Here's the on the difference I personally found between the two engines. "Taurus 3.2 and DA 50."
The DA 50, is not equal to the Taurus at this particular time because even though you'll otherwise, The DA 50, still has some bugs that need to be sorted out. I've owned both engines so I think I can speak with some 1st hand knowledge. Or, better yet, just go to any flying field when someone is running a DA 50, and listen for yourself. You'll see.
I'm running a Taurus 3.2 in an 87" Yak 54, (16lbs), and it has much more power than is needed for unlimited 3D. The Taurus is also far superior to the DA in throttle response, midrange, and especially in viberation.
There you go. That's my opinion based on my experience between the two engines.
The truth is, your question can be researched quite easily right here, right now. Just do a search on the two engines and you'll have your answer in a very short time, which engine, is the best engine for your 27% aircraft.
As far as the weight difference between the two engines,probably not enough to even consider.