The verdict
If your reps keep sending the wrong price or unapproved terms, I'd pick Proposify. The locked content and the CRM data in the document fix that, and approvals on the Business plan add a check before sending.
If the deals are complex and the trouble is keeping five buyers on the same page, I'd pick GetAccept. The stakeholder tracking is where it earns its keep. For most small B2B teams, Proposify is the easier fit, because the entry plan of GetAccept moves you to an annual agreement with at least five users once you want CRM integration. Proposify has its own catch: send limits on each plan, with extra sends charged.