The best replacement for randomized controlled trial is randomized clinical trial.

The best alternatives to randomized controlled trial are rated as following:
★★★★★  randomized clinical trial
★★★★  cohort study
★★★  observational study
★  meta analysis

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No companions for randomized controlled trial have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of randomized controlled trial in all years. Click on graph for more.
randomized controlled trial
randomized clinical trial
cohort study