In answer to the question of where do you put your money for maximum tax efficiency, an assurance vie is certainly the best place to put it. The French have continued to favour this investment over the years. According to the French Insurance Federation (FFA), in 2019 the premiums paid into assurance vies increased by 3.5% in 2018, to a total of €144.6 billion. I subscribe to a French financial magazine and every year they do an article on the best assurance vies in the market. This gives me an interesting insight into which products are recommended for the typical French investor.
What is interesting to note is that it is very rare for bank assurance vies to appear in this list. Banks have several assurance vie products under different names with different offers and it can be hard for the consumer to understand and compare performance and costs. Every member of my household, including my children, has an assurance vie, because even after social charges on the part in Euro funds, they are more likely to outperform any cash savings accounts. For example, the Livret A (the preferred savings account of the French) and the LDDS now only pay 0.5% interest per year and any other savings account offered by banks only generally offer between 0.2-0.3% interest which is not exempt from tax and social charges.