Video Enhance - movie trailers help needed

I’m working on a Blu-ray project, and I need to upscale several movie trailers from a variety of sources to 1080p. Some are from VHS, some are from DVD.

Any suggestions about how to get the best possible quality upscales would be most appreciated.

I’ve read a few posts here about using AVIsynth scripts before using Video Enhance AI. I’ve not used AVIsynth before, but I’m willing to give it a try if it’s the best way to pre-process video.