I'm not a plumber, but as a home builder I've installed many of both. I would give them both a , though Grohe can be a little price-y imo.
1 CORINTHIANS 1:18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
ROMANS 1:16-17 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.