Price Performance Tradeoff Discussions-Services

Hello all. I wanted to reach out and see if anyone has experience with making price performance tradeoffs for services. I am particularly interested in knowledge-based services/professional services. I am looking for cases where you have awarded to other than the acceptable low offer and the rationale had to do with quality/past performance reasons. If you have and would be wiling to talk via phone or messenger, please let me know. Thanks in advance