The v10 is better. Many of the options you would get on the v8 were included on the v10 so by the time you optioned up a v8 you were only about $15,000 away from the v10
Resale etc would nearly take care of that down the road when you sell it so it was a no brainer.
Now the v10 plus is another big jump so that’s a new discussion.
Transmission wise the old manual was pretty awesome with the gated shifter. Rtronic was not very good and was crazy expensive to option up as well as repair prone.
New cars get DSG which is a light year better than Rtronic.
If I were getting one I would try for a plus with dsg or a manual v8. For what it looks like the v8 is really slow. I mean it’s the same engine that’s in my rs4 and I have my hands full with bone stock $47,000 b8 s4s, so it’s a bit underpowered. Still its a super fun, super cool car. The upgrade paths becoming available will have you equalling a v10 plus.
Note-the v10 plus has been tested at 11.3-11.5 @ 123-125 mph. It’s very for real.