Have ridden a lot of tandems in the last 35 years and my thoughts are as follows.
You will be spending a premium amount on this bike so it would be good to make sure what you buy makes YOU happy.
One mans noodle can be another mans comfy ride.
What works for some would be unacceptable for others.
Every team has different needs and expectations.
Some folks stand and power a lot and others never stand.
Some folks decend hard and fast, others not so much.
Some folks are very performance minded, others not so much.
We all have different expectations from our machines and what will make each of us happy differs greatly.
I suggest you beg, borrow, rent, attend rallys, make friends who have tandem bikes of different materials and ask to ride them. The differences in ride can be huge. It is very eye opening for sure. Many of my preconceived thoughts on things have been right and others totally wrong.
You will find what YOU like and be able to make a better informed decision.
What makes this even more challenging is same material buit into a bike by different manufacturers can also ride very differently.
So, bottom line. Test ride all you can or buy an entry level bike in meantime while searching to build the dream bike.
I hope you end up with a bike that suits your needs and will be happy with it and ride it a lot.
Good luck