In my specific case I am running HO so my orginal question would be related to that scale. It sounds like Walthers track could be quality stuff worth getting. Mainly the turnouts. Anyone care to comment too?
I run Code 100 throughout my layout, primarily for reliability, and also because I have a LOT left over from previous layouts, including some brass rails on fiber ties! (Used on some sidings.) I use flex track where tight curves aren't involved, and I just pick up whatever Caboose Hobbies in Denver has on their shelves.
OTOH, Shinohara Code 100 curved sectional track comes in a variety of radii ranging from 18" to 32" in 2" increments. They
are pricey. For 18" and 22" radius, I'd go with Atlas Snap-Track, as they are about 1/3 the price of the Shinohara! But, if you need some other sectional track radius, then Shinohara is your choice. For example, my layout is restricted in room, and I just didn't have enough to use 22" radius Atlas track, and 18" was to go inside the main in certain places. Shinohara 20" radius was just the ticket! Both Shinohara and Peco turnouts are great, especially where you need dual curvature diverging routes, or three-way turnouts. I like Peco turnouts where I can throw them by hand. I don't especially care for Peco's switch machine, however. They must either be mounted under the board (which I can't do in places), or at right angles to the track, unless you can cobble up a bell-crank to allow for actuation.
Shinohara turnouts, of course, require some type of switch machine purchased separately. I do use Atlas Custom Line and/or Snap Switches in places, especially where I can't mount the machines under the table or simply want the convenience of just laying them in place and connecting the wires. I disguise most of my above-table machines as piles of dirt, ties, relay boxes, etc. Makes for easier mainentance. My only caution about Atlas #4 turnouts is that the present production sometimes have gaging problems with the turnout points. It can be fixed, but is a nuisance, when they are supposed to be usable right from the box. Regardless of brand, buy an NMRA gage anyway.
BTW, Atlas Snap Relays can be handy for signalling, track power routing, etc. You can hook the solenoids up to AC, DC, DCC or whatever and the relay contacts can be of a different type of power. They have DPDT contacts that provide a "latching relay" effect, and the twin coil solenoids do NOT require other than the momentary power that actuate the switch machine itself. They will NOT work with low-current continuous pressure switch machines, as the coils would burn out on the relay.