The distinction between transitional and didone


I saved pictures from typefaces from the foundry Swiss Typefaces and I always sort out the pictures I save according to category so I can find everything back on my computer. Now, I have a bit of trouble with categorizing two of their typefaces: [[https://www.swisstypefaces.com/fonts/romain/|Romain]] and [[https://www.swisstypefaces.com/fonts/sangbleu/|Sang Blue]], which are both related. I have the feeling it's just the contrast that makes me think they're didone-like, while the model is actually transitional.