首选的快捷风格

Question

首选哪种款式？哪一个更快？

titleLabel?.adjustsFontSizeToFitWidth = true;
titleLabel?.textAlignment = NSTextAlignment.Center
titleLabel?.minimumScaleFactor = 0.2

VS

if let lbl = titleLabel? {
    lbl.adjustsFontSizeToFitWidth = true
    lbl.textAlignment = NSTextAlignment.Center
    lbl.minimumScaleFactor = 0.2 
}