I tend to look at it from the "do I want to fully unbundle my line" aspect.
If you are happy with this then SKY is an option, if not then BT, Plusnet etc are your options.
I have never been prepared for my line to be fully unbundled so when looking at fibre I did not consider SKY.
The nature of FTTC means that suppliers are pretty much of a muchness (more so than ADSL2) so my dislike of SKY for my earlier issues on ADSL no longer apply.
Still happy with BT for now but when the contract period is up I will be considering PlusNet.
BT Infinity 2 - IP profile 77 / 20 - super fast!
Previously BE Unlimited - 21,000 Download 1,200 Upload but then moved house - 6,500 Down, 1Mb/s up - gutted!
Ex <n>ildram , been to SKY MAX - 15,225 Download