Social Democracy and Democratic Socialsm aren't synonymous, unless you redefine the meaning.
This is social democracy:
https://en.wikipedia.org/wiki/Social_democracy"Democratic" Socialism is a form of socialism, Social Democracy is not.
The socialist party that ruled East Germany (the German "Democratic" "Republic") became the Party of Democratic Socialism after the German reunification. They are socialists.
And looking at the Wikipedia entry of Democratic Socialism, I seem to be in good company with my opinion:
"a society which is socialist cannot also be democratic, in the sense of guaranteeing individual freedom"-Milton Freedman
If you want a system with better social security, then you want social democracy, or better yet, a social market economy.