Quite different speeds in ADSL Checker between two lines in same house
I have two lines in my house. The line currently used for broadband shows quite a slower speed in the ADSL checker than the other line, as below. If possible, please let me know if it's worth switching broadband to the other line or not. Currently getting around 45 mpbs for the current line, on Infinity 2.
line currently used for broadband:
Other line ('phone only):
Also, what is significance of Bridge Tap = U for the 2nd line?