I was re-reading the Film Developing Cookbook last night, and I found there was a very sorry lack of information about tonal rendition. It's all about grain, effective speed, and sharpness. In my opinion, those are secondary considerations nowadays, even with 35mm, given the amazing modern lens and film technologies available.
Of course, films vary in the way their curve is affected by developers, so one should not make a blanket statement like "HC-110 is all about the highlights for every film ever made." But I'm paying increasing attention to tonality now, so I think the next time I go through the ordeal of testing film, I'll try to plot curves to have a sense of what the shadow/midtones/highlight contrast can be. And I'll make sure I understand how paper curves affect these tones.
In this respect, I've had very different reactions to Plus-X in XTOL vs. Plus-X in HC-110.
I did not care much for PX in XTOL: it's nice and clean, but it does not have the same character than it has in HC-110 (that midtones thing). For me, XTOL really shines in 35mm, with a straight film like Tri-X 400.
But I'm not a fan of Tri-X 400 in 120, perhaps because my first love was APX 100 in Rodinal, and the latter always created very nice highlights. So I guess in 120, I really like a film that sparkles in the highlights, and in 35mm I like a film with nice midtones.
All of this has very little to do with grain, sharpness, effective speed and the other usual obsessions.