When burning a DVD created by DVD-RB Pro\CCE which is best and why, to burn the contents of the Video_Ts folder(Vobs ect) or to create an ISO Image file and burn that.
Nothing wrong with just burning the video_ts. Creating an ISO isn't "wrong" either but it's definitely an extra step that you don't really need.
Basically comes down to personal preference and how one prefers to burn the movie. Personally, I like to create an iso file because I prefer to use Imgburn to burn my DVDs, but again, comes down to personal preference.