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I've used mostly Badger brushes for the last 30 years and recently bought an Iwata late last year. I used it a couple times and it was VERY good and I liked it better than my Badgers. Having said that, I tried a Grex at a model show this spring and bought one on the spot. Awesome brush. I will probably never touch the Iwata again. I am in the process of moving and don't even know where/if I even packed it. Grex all the way!
I will mention some things that may be useful to you...
If you use a particular style of brush and get used to it (like a traditional jar feed brush) then switching to something like a gravity (top) feed may feel really, really awkward.
There is something to be said for getting a brush that is easy to get parts for. Hobby Lobby and other chain stores sell Badger, Paasche and Iwata. So if you break something, you can zip over to a local shop and get a replacement part. Otherwise you may be stuck waiting days/weeks for a part to come in the mail for a less common brand.
Don't buy a brush that is overkill. For armor modeling, I have found good quality middle of the road brushes do fine. On the other hand, I do paint stuff like 1/72 Luftwaffe camo, so perhaps my needs for very fine painting are different than yours.
Make sure you get a good air supply. THats just as important as the brush itself. Lots of people buy a good brush but cheap out on the air supply and then the brush performs poorly.