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How should I choose an additional retirement investment plan?
It's a hard decision to make. Especially without knowing the complete contract details. I would in general stay away from financial "advisors" like tecis or other pyramid selling companies ("Strukturvertriebe" in german). They usually only offer a very limited range of products. In most cases they sell only 1 or 2 products and tell everyone that these offers are the best and fit exactly to the client. I would prefer an insurance broker (requires an education) which could in theory offer any product. Coming to your situation: If you already have a Riester product which is maxed out, I see no point in another private insurance without any aid. The insurance construction allows you to save some taxes but it does cost you a premium. I would buy the funds (preferable ETFs) on my own. This comes down to the question: Does the insurance construction payoff for you for the costs it generates?