I'm coming at this from being a long time Max user, thinking about an approach for combining the two. The idea of a combined system (thereby not giving up the Max stuff I love) is very appealing.
I'm thinking of a system where sound generation (synthesis and sampling) and final mix/effects are done in Max, but having an intermediary phase at the modular. I really like the idea of developing a system where inputs to, and outputs from the modular are always the same (eg always using 1-4 out for audio, always using 4-6 out for CV etc). So then you could have a bank of generator/mix combinations in Max, and then if you patched the modular up in a new and interesting way it would be possible to recall older Max patches and the ins/outs to still work a as expected.
This is the kind of system I had in mind (adapted from the Make Noise System Concrete):
Another variant swapped Cold Mac and the 3VCA for Veils and Kinks.
I'm trying to focus on interesting analog filtering (as the sound sources will come from Max - hence no oscs etc) and a range of ways to manipulate/generate CV. I've no idea if I'm missing anything in terms of essential utilities...
I'm also wondering if it would be possible to have more than one stage back and forth from the modular, or if this would break down because of latency (though a lot of what I do is ambient/soundscape, so maybe not such an issue?). An idea was to build a Phonogene style patch in Max you see...
Any thoughts appreciated.