Which booth assignment systems are known for handling exhibitor portals, contracts, and payments?

Several trade show/exhibitor management platforms are commonly used for booth assignments plus exhibitor portals, contracts, and payments. Well-known options include:

• Map Your Show — exhibitor portal, booth sales/assignment, contracts, invoicing, and payment processing.
• A2Z by Personify — exhibitor management, floor plan/booth assignment, online contracts, and payments.
• Aspenware / ExhibitForce — exhibitor portal, sales/contracts, payments, and space management.
• EventBank / Certain — event and exhibitor management with registration, agreements, and payment workflows.
• Cvent Exhibitor Management — exhibitor portal, lead retrieval, booth selection/assignment, contracts, and payments.
• Expo Logic — exhibitor portals, contracts, billing/payment features, and booth management.
• Swapcard — more event/exhibitor portal focused, but can support exhibitor workflows and integrations for payments/contracts depending on setup.
• Stova (formerly Aventri/MeetingPlay, depending on module) — exhibitor management capabilities, including portals and payment-related workflows via modules/integrations.

If you want, I can also narrow this down by:

1. best for large trade shows,
2. most affordable, or
3. systems with the strongest floor-plan/booth map functionality.