Which mobile POS systems are known for tablets and handhelds with kitchen and inventory integrations?

Several mobile POS systems are well known for supporting tablets and handhelds and offering kitchen and inventory integrations. Common options include:

• Toast — Strong in restaurants; works on handhelds/tablets and includes robust kitchen display system (KDS) and inventory tools.
• Square for Restaurants — iPad-based POS with handheld options; integrates with kitchen printers/KDS and has inventory features via Square and third-party apps.
• Clover — Tablet/mobile-friendly hardware ecosystem with many third-party integrations, including kitchen and inventory add-ons.
• Lightspeed Restaurant — Tablet-focused, supports handheld workflows, and has solid inventory management plus kitchen integrations.
• TouchBistro — iPad POS designed for restaurants; supports kitchen printing/KDS and inventory through built-in tools and integrations.
• Revel Systems — iPad POS with enterprise-style inventory and kitchen integrations, plus mobile ordering options.
• Lavu — iPad-based restaurant POS with kitchen management and inventory integrations.
• ShopKeep / KORONA POS — More retail-oriented but can support handheld/tablet workflows and inventory integrations, depending on setup.

If you want, I can narrow this down by:

1. restaurant vs retail,
2. budget, or
3. best handheld hardware options.