I suppose a pragmatic test would be to ask whether the filioque, properly understood, leads to any different conclusions with regard to the different dimensions of theology:
Theologically - can we say anything different about God adopting the Latin and Eastern formulations about the spiration of the third Person of the Trinity?
Christologically - do we arrive at a different understanding of the identity of Christ based on these different formulations?
Morally - ought we, in imitation of God, to behave differently depending on which of these understandings we hold?
Eschatologically - can we say anything different about Godâs purpose and the purpose of life based on our understanding of the Holy Spirit in East and West?
Ecclesiologically - does the Church, guided by the Holy Spirit, act or constitute itself differently on the basis of its understanding of whether the Spirit proceeds âfromâ or âthroughâ the Son?
If none of these are different in any way, then it would seem we believe the same things.