I voted for the TDX, but I have a #4 jet in mine & the brass top. My reasons for this choice:
NO corrosion risk with the brass top, aluminum isn't a good material for in a water loop. It just saves the blocks maker money.
And the TDX with the #4 jet offers better performance than with the stock jet. Should really come already installed IMO.
TDX with 2 barbs is a easier install than the WW or RBX blocks.
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