Your criteria seems to be based mostly on considerations around the developing of the film. That seems an odd way to choose between print and slide film.
There is nothing like a slide. Each one is a unique jewel mounted in its own frame. Viewed directly in a good quality viewer, and it is like stepping into the scene. No print can ever match the richness of a slide.
^ +1 But you'll need to do your homework regarding E6 exposures to absolutely nail them to the get very best results. Aint no generous latitude to ease you over the line like neg film...
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