See, here's the point - it's terribly unwise to have a "favorite" anything unless you've actually had a chance to use the darn thing and see how it performs in the real world. This isn't an gamer board - we're not discussing variable values and pixels here.
Case in point - the FN2000. It looks slick and cool as anything in the photos. Yeah, I thought it looked pretty awesome in 2003 or so. Then I finally got the chance to play with one. Aside from that thick, light receiver being awkward as all heck to handle (and covering most of the mag), the innards look like they've come out of a blasted Mr. Coffee. No way I'd ever want to buy one now, even if it does come from a company with a very good reputation for making quality stuff.
So you see, someone can't give you any meaningful opinion on a weapon they've never even touched.
So here's my review -
I've field stripped, examined, and fired a G36. Same for an M4A1.
Handled an AUG and some of the internals, but never fired one or broke it down.
I've never even seen a piston-run AR upper or Tavor in person.
Based on that, I can say I think the G36 is decent, but would prefer an AR platform given my druthers. (for reasons of usable barrel length as part of overall length, ergonomics, magazine profile, and parts/expertise availability in the US).
The AUG sure shoulders comfy, and I'd certainly not turn one down, though I'd want to take more time getting accustomed to how it does its thing. No way I'd pay the premium the few in the states have though. As already mentioned, I've absolutely no interest in an FN2000. Couldn't even begin to tell you about the Tavor, and given my experience with the AR to date the 416 is an answer looking for a question.
But to each their own.