Hi A and C
Like you said its an opinion, however for the IR course and test its a fact.The examiner will not allow you to use the moving map and load up approaches on your MFD.
Just to defend my opinion... I teach candidates on both types of machine.
They all have the good and the bad, but the bottom line is that its cheaper for the student to use a machine that consumes 40 ltrs of jet fuel (tax free) per hour than one that consumes 80 ltrs of Avgas an hour ( not tax free)
The real problem with the Diamonds at the moment is the Thielert engine situation.
The ability of a pilot depends on a lot more different factors than just what aeroplane he/she used for the CPL/IR course.
Anyway only my opinion-I hope it helps you guys decide what aircraft to use...