Trezor Wallet is an easy-to-use browser interface for Trezor powered by SatoshiLabs. Using the Wallet, you can easily setup the device, manage your cryptocurrency assets, initiate transfers to other services or friends, and more.
See also: Apps:Trezor Wallet
Trezor Wallet (wallet.trezor.io) is the official production-level, battle-tested version of the web-wallet interface. It is feature-conservative, meaning new functions are added at a slower pace and only after they are thoroughly tested. The purpose of this wallet is to provide a stable and uninterrupted access to Trezor functions.
Trezor Beta Wallet (beta-wallet.trezor.io) is a less-tested version of the web-wallet. New features are released here first before we consider sufficiently reliable for the production wallet. It serves as a public feature-testing platform for the Trezor community, providing power users with quick access to new features.Old Wallet (old-wallet.trezor.io) is an older version of the interface intended for backwards compatibility when a new version of Trezor Wallet is released. It is useful when some significant changes are applied. In other words, the previous version of Trezor Wallet ends here when it is replaced by the current version.
Wallets can be used interchangeably, as they are only the interface to your Trezor device.