If you choose to not export in 32-bit and want to keep working with the audio file, Triangular is the safest mode. This is generally after mastering the track or when you want to burn it on CD. Dithering should only be done at the end when you won't export the file again.
This option is useful if you want mono files to be used in a different audio software or want to include mono files in your Live Set to keep it small. 'Convert to Mono' will render the file in mono.'Render as Loop' lets you render the file as a loop including any effect tails.All options will render the post-fader signals including insert effects.You can easily find the one you want since the track numbers and names are listed. Or you can choose a specific individual track or return track.'Selected Tracks' only renders all tracks that were selected before opening the export dialogue.That includes all MIDI and audio tracks as well as return tracks.
You can listen to the song once more to ensure it's all good. Also make sure that no clips in Session View are launched as they'd be rendered into it as well.