Analyze and compare the effectiveness of three distinct Net Promoter Score (NPS) workflows.  Each workflow should include a different approach to survey distribution (e.g., email, in-app, SMS), a different set of follow-up questions (consider both positive and negative feedback), and a different method for analyzing and acting on the results (e.g., simple aggregation, sentiment analysis, customer segmentation).  For each workflow, describe the steps involved, potential challenges, and expected outcomes.  Finally, evaluate the strengths and weaknesses of each workflow, considering factors like response rates, actionable insights generated, and overall impact on customer satisfaction and retention.  The output should be structured as a comparative table summarizing the key features, advantages, and disadvantages of each workflow, followed by a concluding paragraph recommending the most effective approach based on the analysis.  Consider the following metrics for evaluation: response rate, average NPS score, customer churn rate, and customer lifetime value (CLTV).  Assume a fictional SaaS company with 10,000 active users as the context.