I've ask the same question and apparently nobody has used both.i have the argtek and am very happy with the performance of it and the fact that it includes both directional and Omni antennas makes it a better option for me.the dbs looks to be a directional only setup but I can't verify that as I only have the argtek.
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I have both, the "Argtek" and the "UAV MAXX " I get a substantially greater distance using the UAV MAXX mod