I am not sure about the truth or not, but there was some report that Peco was going to drop the code 100 range in the future.
While I use Peco 100 on my layout & have no issues with it, & find it reliable, which is the main aspect as far as operations are concerned, I used it for a couple of reasons, & that was primarily based on the aspect of cost, also I had a fair amount of it before I started my existing layout.
Back then & not too far distance, the price variation between the 3 Peco track codes was quite a different, today its a lot different so makes the choice somewhat easier, especially with the choosing based on cost. Code 75 is now almost on par with Code 100 in Peco brands, with 83 the most expensive as already pointed out.
If I was starting out today especially in the building of a serious layout, then I would certainly be going for the code 75. If the Hornby track which I would think is code 100, & is compatible with Peco track, you could still use that in hidden areas by using small adapter tracks, that Peco put out that allows for smooth transition from 75 to 100, there is an add on the back page of the current AMRM showing it.
As for points, I primarily use insulfrog points, & do not have any trouble with them.... So far no sign of wear on the frogs either.