It depends...I haven't had a Bhut Jolokia, but it seems that it's similar to the Bih Jolokia.
Naga's have a very distinctive flavor unlike a general "hab" taste...more fruity tasting and a burn that truly starts about 1-2 mins in and builds. Runs a lot longer than a hab too.
Bih Jolokia has a almost floral fragrance thing to it, semi-sweet, less pronounced fruityness than and I'd say more piquant than the Naga Morich.
Morich is very fruity tasting and tasty. More hab-like than the Bih. Bih is pure growing heat after a tasty 10-15 seconds of flavor. The irony is that the Bih seems to have a more delicate flavor...but it's so overwhemingly hot you don't get time to truly taste it before your tougue goes about numb..
Dorset Naga is just about the same as the Morich that's it's related to.
I stil say Morich and Fatali are still my favorites so far.
I'd say watch THSC's videos, he's eaten all of 'em and describes them well.
Link:
TheHippySeedCo’s Chilli Test Vid Channel
Best way IMO is to try them youself, even if it's just a tiny slice.
Slice lengthwise, as the ends don't have most of the flavor and heat.
-QS