I've been eyeing this beast and thread for so long.. and I just had to ask before I buy it. I'm currently using Xperia . And i really really need durable battery. But I'm also outdoor-ish. So

1) is the Korean version or international better? Like, battery-wise (nonremovable but bigger mAh vs 2 smaller mAhs) etc etc..
2) is it gonna be worth the trade from my Z? I mean, Stamina Mode and waterproof is great but I think can buy waterproof bag when I go outdoor-ing right.. or no?