More features means more things to go wrong, I assume you want a phone because your business relies on it, when then get one you can rely on, one that functions without showing off ....
I would consider blackberries to be way way way more stable than the iPhones, because they have been about for ever, but I still consider them unreliable, it's basic mathematics, a normal phone has ~15 buttons and will eventually break, a balckberry has more than 30 buttons and so will break twice as fast ...
I get nice simple series 60 nokias that last more than a week on a single charge, like I said they never go wrong, I know I can rely on it to work, with what I save on posting my phone back and forth to the repair shop I carry a webbook around when I'm away from home for a few days, before webbooks I'd just take a standard laptop ...
I had a balckberry for work once, I'm quite a technically minded person and always have been; I never used anything so difficult in my life, I'd rather have to control a crushing machine full of children, while drunk - than hold another one of those things in my hand ... also my fingers are fat and these fiddly devices just don't work in my big fat hands ...