If you're playing in a small church a Wurlitzer organ is probably a better fit than the pipe organ Bach played in the Blasius Church in Muhlhausen.
If you add subwoofers and a capable power amp for the AsciLab A6B for the remaining money (17710€) to match the price of the Sigberg Audio Saranna, which system do you think will have the better chance of filling the larger church with sound?