A few notes on the actual topic.
The Tornado successor decision in Germany is a political item. The two frames - Eurofighter and F-18 - preselected so far do have definitive qualities in themselves that make them favourable for those groups that push them. And in that they vastly outmaneuver the two frames not chosen - F-15 and F-35. The CDU-led MoD pushes the F-18, the mostly-SPD-supported Parliamentary Defense Committee pushes the Eurofighter.
Points that do work in favour of the two are:
a) Militarily: Germany has committed a future Airborne Electronic Warfare capability to NATO with a defined target date. While all four airframes can be converted to support that, this would take development time and investment; the F-18 provides a off-the-shelf solution to this in the E/A-18G Growler which could be introduced relatively rapidly.
b) Politically: NATO nuclear sharing is somewhat in doubt with the SPD at the moment, in particular more recently due to the row over INF (it's a long term issue currently amplified). Eurofighter presents an opportunity to separate the NATO nuclear sharing question from the airframe succession question by procuring an aircraft and then postponing a decision on certifying the frame to carry US nuclear weapons. Due to the higher hurdles with Eurofighter this is a preferred solution to this conundrum for the SPD.
c) Industrially: From an industry politics viewpoint, the government wishes for a "temporary solution". While this is reminiscent of former "temporary solutions" that way outlasted their stay - like the F-4F - this is relevant in the decision. It means that a fifth-gen airframe that could possibly last in the Luftwaffe for thirty to forty years is not what this procurement is intended to produce. This is further amplified by the stated timescale of cooperation with France.
d) Also industrially: Eurofighter is produced locally. Yes, that is a point, in particular for the SPD. Employment and all that. However, Eurofighter is also produced by Airbus. That is a point against Eurofighter given the row between the government and Airbus in the last 2-3 years. Given the Eurofighter T1 replacement being handed out, it is very possible that this is all Airbus will get.