I guess it is best to use trains. Check sncf.com for prices. Tickets can be bought 3 month in advance. There is also a night train connection via Metz.
car is quickest; perhaps 7 hours on motorways.
Train is nearer 8, and may need 2 changes.
Plane is out- silly fares and several changes.
thank you very much for your comments! we will need to allow quite a bit of travel time to reach munich but i'm sure it will be worth it!
Strasbourg would make a very nice stopover if you want to split the train travel. So does Heidelburg, but that would require changing trains more often.
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