just to point out some issues with this...
1) you came to a backtrack thread to ask are other products better then back track
2) your asking with no experience are the other tools having "more tools" then back track
sooooo I dont see what your looking to glean from this post. The answer I would professionally give you is stick with windows. that said..
you might want to try them all out and first answer for your self... what are you trying to learn or do...
check out
Hack From A Cave which has a copy of just about everything in one tool. this is not really a installable but a swiss army of all the distros and what they do to help you understand why asking "I WANT ALL TOOLS" is goofy.
2nd this is just a copy of ubuntu that you can install whatever you want into it. the backtrack team just maintains a full working set of tools for the sanity of others so they dont have to
backtrack also has this nice learning thread where people only lightly beat up on you for your questions
there are also videos and arguably the most 'nub3s' working with backtrack so if your smart and use serch engines your questions have already been asked ... somewhere.
my 2cents.