For one looking to break into 2 Rail O Scale. I'd say the simplest way for the average guy is to buy into the Atlas 2 rail line since they have turnouts ready to go which match their flex track lengths and also their sectional parts if one choose to use those. Now if your adventuresome and want to get more hands on the construction of ones own turnouts, that opens up a new opportunity and the various rail codes sizes, which you've expressed interest in, come more into play as well.
If you search into the multitude of various discussion that have taken place here and elsewhere you will see the availability of suitable turnout has always been the 2 Rail stumbling block.
So you need to decide what your willing/capable of doing on your own, and proceed from there. The various brand names you tossed around in your question are for the most part less acceptable ways of entering 2 rail reliably in my opinion. Stay with a source you can get predictably, as I suggested above. Others will have opinions as well.
Handlaying requires supplies and many potential source are available, but be sure you want to leap into the deep end of the 2 rail pool before you chase that side hobby.
2 Rail is a world unto itself and many of the ready to go items associated with 3 Rail toy trains are just not there unless you dig deeper into the hobby. We feel it's well worth it.
Bob