Thanks everybody for the answers!
It looks like that the two reels option is what I should prefer, for the time being. Since this is my first attempt at developing BW on my own, I think I can stick to one single tank for now. If my experience is successful (and my family won't complain for the mess in the bathroom ), I might consider your advice of adding further tanks.
Just to share what else is in my cart:
- Rodinal 500cc
- llfostop 500cc
- Agefix 1L
- Agepon 250 cc
- Paterson Thermometer (Alcohol)
- Graduated Cylinders (50cc and 650cc)
- Kodak Tri-X 400 (5 rolls)