Please help. Prove I have not made a mistake in switching from talktalk to BT!

Been with BT for about 3 weeks now and due to connection problems I am regretting the move to a company that SHOULD be better than its rivals.

Problems:-

1) Laptop cannot even find the wi-fi signal from my "Smart" router showing no networks found or no network available. Wired via TP Link the speed is great but even wired the connection is often lost.

2) Wi-fi analyser on my phone shows stars according to signal strength. Channel 1 that I am currently on has 0 stars, 6 has 0 stars and 11 has 2 stars. These are my only channel options and all are bad. My talktalk router had me on channels 1 or 6 with 8 or 9 stars! On the BT router only channels 12, 13 and 14 have any decent strength with 4 - 7 stars and I can't choose those.

3) My daughters i phone regularly loses the wi -fi signal and we have to Forget Network and re-enter password for it to come back again.

Is there a fault with my Smart router?
Should I try using my talktalk router to see if any better?
please help.

Thanks.
Connected Device Video