Settings for LR editing?

[vr8ce]

Using AP 1.5.1 with Lightroom 6.8 on OSX 10.11.6.

 

When setting AP as an external editor with LR, what is the preferred file format — TIFF or PSD? PSD sounds like the obvious choice, but there were issues with using it prior to AP 1.5.1.

 

I've watched the new video on PSD round-tripping, but it just addresses the AP preferences, not the LR ones.

 

Thanks!