In my opinion somebody travelling on such a major journey will need a significant budget and a great deal of flexibility. Therefore the continuous pass is a no-brainer, for about an extra 200 euro
I would also suggest first class for a further 200 euros or so on either pass - Only about 10 euro per travel day.
I have just finished with a 10 day 2 month pass where I planned all 10 days to the last long distance second and buying cheap day tickets for local runs,.
Circumstances meant a major change which would only need 8 days of the planned usage so had 2 days using the 2 travel days for local hop-on hop-off trips. No need to worry about buying many tickets at a few euros or even medium distance day trips on ICE and IC type trains.
Exanples of day trips from a base such as Munich would be Nuremberg, Strasbourg, Vienna,
From Cannes you coud do Marseilles, Nice and Monte Carlo.
This has the advantage of leaving luggage in a base for a few days and even special multi-day rates in hotels or apartments. There is always a good selection of accommodation near mainline stations for early starts and late finishes