I would not base my track choice totally on the likes of others. It is something you will be using and you need to be the happiest with it. Your needs and wants may not be the same as someone else's. Personally, I would take in all the advice of others, there is a lot of good advice here, and then decide for myself and make my own decision.
From Mr Muffin's (a dealer) post the other day, it sounds like the Atlas track problems may finally be coming to an end. During all this track shortage, my LHS has gotten me all the straights and curves I needed, it was the switches that were in extremely short supply for a while.
Many folks here use Gargraves/Ross, but there are also a lot that use Atlas, Realtrax, Fastrack, Scaletrax, RMT and tubular (and everything I missed). There are a LOT of pictures posted here showing Atlas track on the layouts. Same goes for the others. It really is a personal choice, IMO, so get what YOU like and want to use. Just like deciding on what size curves too use, how big to make your layout and what accessories and scenery to use.
