disposable diapers 101 please!

Diana • TTC #1 successful May 2016, thanks to Glow
Well, not entirely 101, but I'm putting together a list of all the newborn diapers - brand, name, store (including online retailers), number in package or box - and then dividing to get the price per diaper. 
I'm now wondering....when it comes to the two major brands, Pampers and Huggies, what are the real differences between their different names - ie, pampers sensitive, pampers swaddlers (then I think there's a pampers swaddlers sensitive?), pampers baby dry, huggies little snugglers, etc? 
Is this just marketing or are there actual functional and physical differences among these, even though they're all newborn sized?
Maybe you can point me to a site that explains it? Hubby is Netflix and chilling and I, per usual, am the only one actually interested in educating myself for parenthood. 
TIA!