I don't have an Izula (yet

), but I can comment on the Becker Necker. If you're concerned about the bottle opener/wire breaker on the Necker, it's really a matter of your hand size. If you've got big paws, then there's a decent chance it'll bother you, especially if you're working the knife real hard. Keep in mind though that the Izula is even shorter and in that respect wouldn't be ideal either.
I have medium sized hands, long fingers but skinny. For me, there's really no way the bottle opener can bother me when I use the Necker. One, my hand isn't big enough to regularly push my palm into it. Two, the opening is so small, that your palm just works around it. Only time it bothers me is when I'm driving the knife straight into something with my palm which is . . . never.
As I'm sure you've noticed, both knives have a big following here and for good reason. They're relatively inexpensive (though I'm surprised the Izula is 1.5 times as expensive as the Necker), they're backed by good companies, and they're just very handy. If you've got the money, just get both. You can see which is more to your liking. If you're like most guys on BF, you'll keep both

, but if you really like one over the other, both knives have good resale value here on the forums, so there's not much risk behind it.