One consideration with the LavaTube is output power. It's claimed to be 15W but I've been seeing reports of much less. Generally it's not an issue for a standard resistance atomizer, but for dual/triple coil or dual barrel, it can be a problem. The LavaTube simply limits current without any indication of an over-load so you end up vaping with less power than the setting should provide. The other device you linked to looks like a dual battery that uses a different kind of regulator with much higher output capability, more than you'd ever need. So with the other device, you get twice the run time and twice the ouput capability.
You have to look at in terms of preference. Most of the stuff in vaping does boil down to personal preference. Do you want the longer run time and output capability or do you want the more compact size. In my case, the priority would be size so I would in fact go for the LavaTube, but again, it depends on what you prefer.