Recommendation for liability insurance (Frankfurt)

I need to organise my liability insurance however I'm not familiar with any of the companies that offer this service or which one to choose.
I currently have a pension scheme with Debeka and they can also offer me the liability insurance.
For me it seems to make sense to have it all 'under one roof' but I would like to know some of the advantages and disadvantages of other companies before making a random decision.
Does anyone have any advice?

Regards,
Allen Taylor