FTTP either BT or AAISP

Currently on Plusnet FTTP trial and looking to move away. (For why read @Jelv's post on Plusnet board as my concerns are the same)

Narrowed it down to BT or AAISP and looking for people on FTTP with either supplier to share their experiences.

The BT tariff would be Infinity 3 or 4 while AAISP would be Home::1 350MB (80/20) (Costs are in the same ball park although with BT I would need to pay line rental for a line that I wouldn't plug in)