Who is your favorite and why? - As of now its the inland brand from microcenter (read microcenter brand)
Also what do you like working with the most PLA or ABS ETC? - ABS because its more durable for my needs, I need plastic that is temperature stable.
Also your choice of 3mm or 1.75? - 1.75 as its better for a bowden setup.
Also favorite color to print in and why? - Black ABS has been the least problematic with a close second of red, natural has been the most problematic as it seems its more brittle but extrudes at lower temp.

One thing to note, I started buying $20-21 dollar spools on e-bay, then I switched to toner plastic when it was on sale at microcenter now I swear that microcenter brand is the best of the bunch, as well as the cheapest ~15USD per kilo and I get to jump in my car and go pick it up in less than 20 minutes round trip....