Indeed the grass isn't always greener on the dark side of the hill...
I came from Max, and loved it whilst I was there. Its tools forged my passion for modelling, and its stack was my best friend for a long time, something I still occasionally miss in Cinema to this day. But as DF points out, often we can do stack stuff another way, and I would find it very upsetting to have to go back to it now that I have been shown the way a UI should work in Cinema. At one point I really liked the UI, and really 'got' the Max way of doing things, but looking at it now I have to agree with all of the above, and put next to Cinema there is simply no contest.
Max's 'Object Manager' is not really worthy of the name in the C4D sense, but its function has never been intended to be anything other than a way to select stuff for editing.
But in modelling, it is a giant. It contains literally every single tool I feel I am missing from Cinema, and even though some of those tools are buggy as hell, and always have been, it is nice to wield that sort of modelling power. Symmetry is an absolute joy to work with in Max. So are proper edge and face constraints, smoothing groups, and crease sets. But shortly after that I run out of reason to love it pretty damn fast.
Certainly zero love remaining for the way stuff looks in the viewport with Max. The working environment and appearance of models is leagues superior now in C4D. In fact I would say only Modo comes a close second, but all the other big names have UIs I actively dislike, and it would upset me to have to be in any of them every day.
Max might remain king of modelling for now, but it's an old old dragon, and one whose crown is slipping further every day...
When even die-hard max modelling leviathans like YouTube's Arrimus 3D start producing blender vids you gotta wonder if their day in the sun and their prime position as Industry Standard in the few areas it still holds that distinction, are drawing to an end...
CBR