I guess I'll go with the Al Star. I don't want to risk a defective pen or just something that could break often.
Good choice! I've got both, and I think you're making the right decision. You don't hear of so many pens, of a certain brand, cracking so frequently (I know, you TWSBI lovers, yours didn't break. I didn't say they all do).
Also, if you haven't gotten it yet, you may also want to consider the Lamy Vista. The Safari, Al-Star, and Vista are essentially the same pen. The Safari is plastic; Al-Star is metal. The Vista also plastic, is a demonstrator and looks very cool.