Atlas track is pretty quiet on it's own, but IMO, Flexxbed will be the quietest road bed. It is also probably the most expensive. I don't know which would be the easiest to use? Eric's Trains has a how to video on using Flexxbed.
Atlas track screws are fine. I used them on my layout. Only trouble I had was when re-using them a couple of times, the head can strip out. If you drill a small pilot hole first (I did not do this) this might not be a problem.
See Ingeniero No 1's method of power connections in his build thread here: Track Power Connection He describes the drill bits, screws and wire used at the bottom of the post. He also has some good tips on using Atlas track and a very nice layout. Good thread to read as well. I copied the track powering methods and they work great. I used OGR wire for power, #16 at the track as described in the post. I was very happy with the ease if connection and also ease of changing things around if you need to. It works very well with DCS and Legacy, I have had no problems at all with either system.
I really like Atlas track and switches. Both have worked well for me. Supplies of track and switches are once again available. I had most of my track before the shortage, but had to use several used switches as they became very hard to find new. The only switch problems I had were with these used switches. Atlas had parts for them and I was able to repair almost all of the used ones I purchased. Some were beyond repair. The repaired ones are working just fine. I would have purchased new switches had they been available. I would recommend new switches if at all possible.
Good Luck with your layout!
