The verdict
For a small team or agency that sends proposals every week to one decision maker, I'd pick Better Proposals. You get a branded page, tracking by section, and the signature and first payment through one link, with little design work.
If your deals involve several stakeholders and you want one place to run the late stage, pick GetAccept. Tracking by stakeholder tells you who to call next, and mutual action plans keep the buyer aligned.
Check plan limits before a demo sells you. Better Proposals puts CRM integrations on Premium. GetAccept needs Professional for CRM integration, with an annual agreement and at least five users.