Or Kodak Technical Pan - Fantastic film, ISO 25 and resolves 400 lp/mm so pretty much out resolves any lens around. Makes grainless 20" x 16" prints and even bigger if drum scanned. (They made it up to 11"x14" sheet size and I shudder to think how much detail you could get out of that)
Downside is that its been discontinued for about 8 years and requires a special developer called Technidol which is also discontinued if you want tones other than black and white (originally it was designed for high contrast scientific and technical purposes, when deved in d-19 you get a 2.8:1 contrast ratio which is literally just black and white). It is possible to dev it in ultra dilute rodinal or Xtol though.
Upshot is that it sells for a fortune on ebay like HIE and EIR do. I was very lucky and able to get 3 freezer stored 35mm rolls for just £13 about 8 months ago. I'm working my way through the first one now and have been since October. Usually it sells for about £30 a roll plus. Don't even think about 120 or sheet, when that appears it goes for £100 plus as its quite rare.