Proposal writing is not one service
Some buyers need a writer, some need a proposal manager, some need capture strategy, and others need compliance review or pricing support. The first question is what part of the pursuit process is missing.
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Useful signals include Capture Strategy, Proposal Management, Bid Writing Support, Technical Writing, Integrated Proposal + Compliance, and Proposal + Execution Support.
Who often fits what
Lohfeld, Red Team, and OST are strong comparison points for capture/proposal maturity. The Proposal Lab and BidWriteBuddy are useful writing-focused comparisons. Federal Bid Partners fits best where proposal support connects to compliance, readiness, and hands-on small-business execution.