I'm trying to figure out which kind of rail system is right for me, and will be most usefull for my future needs.

There seems to be 2 types:
1) Free floating
2) Another type which I cant find a consistent name for.. maybe 'fixed' ???

Anyway... What's the difference between these two mounting types?  What are the benefits and disadvantages of each?

I'm thinking of buying the X-6, but I'm still undecided and flexible.  Thank you to anyone who can provide some clarity on this.

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non floating are cheap and easy to install. FF are more accurate, because the sling  or accessories dont hang off of the barrel. If you use a rail mounted sling or have lots of accessories on your rail, you definitely ought to consider a FF rail, particularly if you swap out your accessories a lot.

What are you mounting on it? If optics, a FF will probably be your best option. I went with the SF M73 as it was easy to install and pretty well made for the $$$ (I have my Ml2 mounted on the receiver). If this will be on a gun requiring match accuracy, then a FF rail is a must. FWIW, I get 1moa out of my RRA 16" M4gery with the M73 on it (shooting on a sandbag).

Chris