CoolWallet Pro is a credit-card-sized wallet that connects over Bluetooth, similar in spirit to Tangem. Ledger sells traditional USB and Bluetooth devices with screens.
CoolWallet uses a secure element and encrypts Bluetooth communication. Ledger's on-device display and physical button confirmation give you clearer transaction verification.
CoolWallet's slim card is easy to carry, but it needs charging and pairing. Ledger devices are bulkier but more robust and easier to read.
Ledger Live is more complete than the CoolWallet app, with built-in buying, swapping and staking across far more assets.
CoolWallet is a stylish portable option. Ledger remains the stronger all-round choice for most holders.