Thanks for your opinion, I'll use Tmax 100 sometimes. I use Kodak BW 400 because it's been promoted in Hong Kong with a very low price last year. It's about US$1.25 / roll. So, I buy many from the store and still using them to take photo.
For this approach I would recommand Ilford HP5 125 or Kodak Tmax 100 to provide even sharper details. Kodak BW 400 is processed under C41 Process (same as classic colour). It is easier to process but will always disapoint as you have to enhance even more your scanning.