If you are going for scale and accuracy then C&L or Exactoscale is the way to go, not marcway. I find their track a little basic TBH. Never really a fan of the rail soldered to sleepers with no chairs melarky. You can add cosmetic chairs but the C&L and Exactoscale with their lovely chairs etc are far better. Its easier to build than you would think too.
As for RTR track, I would go SMP or C&L for plain wooden sleepered track (I tend to use SMP as Marcway is only up the road for me) and fast track base with code 80/82 rail for concrete track (not strictly RTR but near enough for the better track you get) As for points no RTR track is really correct for UK but have read this I like the idea of the tilig. Pre darkened code 83 rail (which would work with the fast track base and code 80/82 rail) slight fexibility so that you can make more flowing designs and single bendy point blades. There are no RTR suppliers of bullhead pointwork to compliment the SMP but Peco code 75 will fix to it with minimum fuss.
I think its safe to say there is no 'Best track' its all down to preference. I personally would sooner spend my cash on a decent exacto point kit than a similarly priced tilig point, and for me Peco, or even more so Hornby, should be fiddle yard fodder. I'm sure there are others that would disagree though. However I don't think that code 100 has any business on a serious layout nowadays. In fact when I flopped open my latest copy of Model Rail this month I seriously thought that the cleckhuddersfax layout was N gauge on first look, the track looked so course (no critisisation of the layout I must add, just a realisation on my part). I guess we all get so used to seeing the fine stuff these days that code 100 sticks out a mile.
Cheers
Cav