Doesnt matter with VAT? Cause the end cost is exactly the same for your customer.
If you incorporate in Germany you will invoice them 100.000 EUR excl VAT (119.000 EUR incl VAT), and then you will have to pay 19.000 EUR to the German government and they will deduct the 19.000 EUR. So end result is 100.000︀ EUR.
If you incorporate in another EU country you will charge them 100.000 EUR (Reverse︁ Charge VAT).
So its the same result.
ANYWAY you must incorporate where you live because︂ of effective place of management.