The blue card has several significant advantages over other German residence permit options:
You don't need to know German to get a Blue Card
The holder of the EU Blue Card can obtain a permanent residence permit (Niederlassungserlaubnis) in Germany in as little as 33 months, as opposed to 4 years as with other relocation options. To do this, you need to prove elementary knowledge of the German language. If you can prove your knowledge of German at level B1, then you can get a permanent residence permit in just 21 months instead of 33 months.
Simplified procedure for moving family members: husband/wife and children can move to Germany with you. To do this, your husband or wife does not need to know German, unlike other residence permit options in Germany
The spouse of a Blue Card holder can work in Germany without restrictions
Simplified procedure for obtaining a visa to move to Germany