Portra is a nice film for many purposes, if you need a negative film. There aren't too many options out there in medium format, so why not invest in a roll of Portra 160 NC, VC, UC, Fuji NPS, NPC, and any other relevant options, run some tests with a color chart and grey card and with the subjects you like to shoot, and make some contact sheets to compare them? Don't make comparisons based on machine prints, which will "correct" the images and make differences between films less apparent.