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Not sure either way. I have zero experience with 1.75 but here are my thoughts…
1.75 is smaller than 3.00mm. Duh right? My thinking is that the smaller diameter is more diameter critical. Lets say there is a manufacturing tolerance of .01mm (or any amount, pick one). That figure is a much greater percentage of the overall diameter of 1.75 than it is of the 3.00. A 58% bigger difference actually. Other than that, I really can’t think of any difference. -
I will be ordering bowden version of the E3D for use with Ninja or filaflex. But I won’t be remote mounting the extruder drive. I don’t like the idea of the drive being a significant distance from the hot end. This would introduce compression into the mix. A meter of flex filament would compress significantly more than 2" of it. That means you have to compensate with larger retractions and such. More messing about with things you shouldn;t have to. For rigid filament, less of a problem.
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Yes
E3D V6 Installation Project
I provide a printed plate as well as a washer spacer set in the thread. Simple items to print. Special tools? Everything came with my Taz 5
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Don’t know. Haven’t tried printing flex with the non-bowden version. I was working on alterations to the standard extruder to try to allow it to print both flex and non-flex without wearing out the PTFE tube. I haven’t worked any more on that project nor have I tried to print flex or semiflex with the E3D.
I haven’t done much with the printer lately. The weather has been nice and I have been spending afternoons and evenings out at the rifle range running my Barrett MRAD at 600yd and testing new loads for it to prepare myself and my 14y granddaughter (she also shoots IDPA pistol comps with me in the winter) for a fall sniper match. This is what I been doing instead of 3D printing lately:
Yea, thats me, fat old fart I am. To wrap your brain around what I am doing, the target I am shooting at is smaller than 1/4 of the build plate on your taz (6"h x 4"w) And I am hitting it from 600 yards (6 football fields or about 2-1/2 city blocks) And I hit it 5 times in a row in less than 20 seconds. And I am working on getting better 
The sound delay you hear, roughly 4.5 seconds between shot and ding, is the .73 sec travel time of the bullet and all the rest is the time sound takes to travel back. Same effect as you see lightning but hear thunder seconds later.
When the weather is nice out, thats what I do. When its not so nice, then I play with the printer