I went through the same thing for a while. You get used to it.
The primary reason for having different names for what appear to be the same thing is intellectual property. Properly speaking, each vendor owns thier name, and likely gets their parts from a different source. There are significant differences in quality between kits of the same "type", so that is something to watch out for.
As an example, I have some Sierra kits from Exotic Blanks. I also have some Classicas from CSUSA. They look basically the same in the catalog, both use the same bushings, and go together the same way. The Sierras fit tightly together and have very smooth action. The Classicas have just a bit of wiggle where the blank meets the nib section. The nib section is just a hair undersized. That said, the Classica is a lot cheaper. As far as I know, it is the only Sierra style pen under $10 that you can get with a gunmetal finish. (I could be wrong)
CSUSA also sells the Sienna, which is a more expensive version of the same thing that I am told does not have that play.
I have bought and will likely to continue to buy the Classicas despite this due to their price. The majority of the people that I show them to cannot tell the difference between a $15 Sierra Elegant Beauty in Platinum/Black Ti and a $3.50 Classica in chrome and gunmetal. I can make Classicas for much cheaper, and thus sell them for much cheaper.
At the same time, I have bought and made several of the Sierra Elegant Beauties for people who were discerning.
The point of all of this is that there are differences, but one is not inherantly "better" than another. There is a tradeoff between quality and price and you have to decide where that line sits for you.