Storing VS Hashing

pragma solidity ^0.7.0;


contract Storing {
    uint a;
    uint b;
    uint c;
    uint d;
    
    function store(uint _a, uint _b, uint _c, uint _d) public {
        a=_a;
        b=_b;
        c=_c;
        d=_d;
    }
    
    function compute() public view returns(uint e) {
        return a+b+c+d;
    }
}

contract Hashing{
    bytes32 hash;
    
    function store(uint _a, uint _b, uint _c, uint _d) public {
        hash=keccak256(abi.encodePacked(_a,_b,_c,_d));
    }
    
    function compute(uint _a, uint _b, uint _c, uint _d) public view returns(uint e) {
        require(keccak256(abi.encodePacked(_a,_b,_c,_d))==hash);
        return _a+_b+_c+_d;
    }
}