If you really liked Tri-X 35mm and just wished for less grain... then stepping up to 120 will give you less grain on the same film.
I have grown fond of certain TMAX-400 characteristics. I like the fine grain, sharpness and the fact I don't really need a yellow filter to get detail in the skies. There's a different reciprocity failure curve too.
None of this is earth-shattering. But those are differences that you might expect to see when you change film.
If you just move to 120 size then everything you remember still holds true.
p.s. I work for Kodak but the opinions and positions I take are my own and not necessarily those of EKC.