True twin rides switch easier since it is completely directional. Directional twins can be different across different board lines. Some just have set-back stances but twin sidecuts. Some have slightly directional sidecuts, but nothing SUPER directional like a racing alpine board or a powder only board.
Only reason to get a twin is if you like riding switch/landing switch when spinning.
Directional or directional twin will give you a bit more float in pow and are made for shredding one direction..
I think the TRS is true twin... you should look at the Mark Landvik or Jamie Lynn Phoenix Lib tech boards.