What version of software to download?

[Leandro Melo]

Hi, i'm a beginner use. I've been trying to set up my development
enviroment in fedora. Don't know if i'll be able to do it, but as i go
one step further i come up with thousands of doubts.
Here's a basic one.
I'd like to download Eclipse (java ide) and there are a few builds for
linux. In my case, i know i'd get the x86's versions, but there're two
of them.

- Linux (x86/Motif) 
- Linux (x86/GTK 2) 

There are an info page that says the red had system would use the gtk
version, so i think that that's what i should use in fedora.
However, i have a doubt: i understand that motif and gtk are user
interfaces software, but i don't understand why would they have two
diferent builds in this case. Can anyone explain to me?
Also, i use default's gnome in fedora core, may it cause any problem?
Thanks.

-- 
Leandro