def evaluate_capabilities(capabilities):
    """
    Evaluate and rank capabilities based on their performance metrics.

    Parameters:
    capabilities (list): List of tuples containing capability name, score, time,
                         and memory usage.

    Returns:
    tuple: The best capability with its details.
    """
    if not capabilities:
        return None

    max_score = max(capability[1] for capability in capabilities)
    best_capability = next((capability for capability in capabilities
                           if capability[1] == max_score), None)

    return best_capability


# Example usage:
capabilities = [('evolved_verified_generate_test_1768680667', 4235.89001196408, 51, 8305.7),
                ('verified_default', 4235.0, 51, 8303.9),
                ('evolved_verified_fib_fast_1769055768', 4235.0, 51, 8303.9)]

best_capability = evaluate_capabilities(capabilities)
print(best_capability)  # Output: ('evolved_verified_generate_test_1768680667', 4235.89001196408, 51, 8305.7)