Boge is just a brand of cartomizer, like chevy is a brand of truck. Some consider them better, some consider other brands better. In the end it comes down to personal preference. If you can, try a few different brands and styles to find what suits you best.
Most tanks are sized to fit Boge or Smoktech cartos. That being said, a lot of other cartos out there, when the same style, are almost exactly the same size as a Boge or Smoktech. If you are using an XL tank then get an XL cartomizer, if using a standard size tank get a standard size cartomizer etc... If you're ever unsure as to what size cartomizer or tank you will need then send the supplier an email to see what they recommend.