All of my times I'm following are from the Massive dev chart.
Tmax100 in Rodinal @ 1:50 is 12min. It seems close to what I did. I cant remember exactly what I did but it was more than 10min for sure. I did find Tmax100 pretty good in rodinal, grain wasn't too bothersome but in most other developers Tmax100 has no visible grain.
Comparing Tmax to Tri-X I find dev times are about the same, if not shorter. I'm not a huge fan of Rodinal though, I do prefer Xtol over Rodinal just because of the way it handles grain and the shadow detail and speed from Xtol is unmatched by most common developers in my area. Also being new to Rodinal I can't tell you whether the times are "normal" compared to other films.
I think that the consistency in tones and contrast come from how silverfast handles the scans. It applies corrections to give a relatively consistent look regardless of developer.
Personally, I like the classic look of Tri-X over Tmax. I know ive said it before. I think that Tri-X has a lot more versatility than the Tmax films, though I havent played much with them. Tri-X however can be pulled to 100,200, developed at box speed, pushed to 800,1600, 3200, and ive seen it pushed to 12500. I dont know if Tgrain films provide that level of flexibility.