Fixed track can't go up gradients ... spline track can be appled to gradients.
Some Fixed Track Junctions have animated points ... some other Fixed Tracks require additional invisible wiring.
Fixed Track requires each and every piece be customly fine rotated ... and some other Fixed Tracks join like magnets.
I know MP Wood v2 works in 04/06 and displays well in 09/10 also, I am unsure about MP Rusty whether it also works in 09/10.
I have tried all the high poly tracks (and they look fantastic on sweeping curves ... but they kink horribly in anything less than a #30 Turnout).
After years and years of picking through tracks that have good framerates, that don't kink in turnouts ... I am sorrowfully back to using Chunky Mesh-MP Tracks.
RTS Tracks are really good looking, the Greenery Tracks are so-so. WRRW, MRT, Std High, Standard Gauge Old/New, are some of the high poly tracks that have turnout kinking problems.