[FiiO Willson]

once again thank you! but i own the btr20pro for a long time and use it exactly as described, but it does not support APTX Adaptive! I want to use APTX Adaptive and thats why i asked initially, if someone already got rid of the bta30pro and got the BR because of the better (more stable) codec APTX adaptive. Ldac is better on paper, but you almost never get the highest kbps because even the slightest movement lets it drop to 660 or lower. Also LDAC consumes a LOT more battery power from the reciever and will drain it fast than APTX adaptive.
So my question if someone changed from BTA30pro to BR13 is still open. I cannot see any advantages of the BTA30pro as i only use it as a transmitter connected to my computer and the soundquality should be the exact same as the BR13 in this case. But i could use the more efficant codec.

You're right about that, too.

Since BR13 is based on the QCC5125, it will have aptX adaptive