The best replacement for slide film is print film.

The best alternatives to slide film are rated as following:
★★★★★  print film
★★★  negative film
★  negative
  color negative
  color negative film
  negatives

Your alternative for slide film is not listed? Suggest!
Speaking about slide film, one probably shouldn't forget about cross processing.

Other search terms related to slide film and their ratings are:
★★★★★ cross processing
You have in mind a companion for slide film and it is not yet here? Propose!



Google Trends

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slide film
print film
negative film