Bridged Wrapped stETH (Fuse) is a wrapped version of stETH, designed to provide a DeFi-compatible token. It maintains a constant balance through an underlying share system, reflecting staking rewards without daily balance changes. This allows for seamless integrations with various DeFi protocols. wstETH is a wrapped version of stETH. Due to the nature of Lido, the amount of stETH on your balance is not constant - it changes daily as staking rewards come in. As some DeFi protocols require a constant balance mechanism for tokens, wstETH keeps your balance of stETH fixed and uses an underlying share system to reflect your staking rewards.