I have both, plastic and stainless. I prefer the stainless as it uses 1/3 less chemistry than the plastic. I do use the paterson style tanks when I get a roll that is unruly or damaged. The last roll of 35mm that I processed was in a plastic tank as some of the sprocket holes and edging were damaged. For 120 film, you don't always have to use the clip if you don't want to. I have loaded a few without using the clip without problems.