I own a Chroma and a 1073 clone (AML ez1073). My opinion is the Chroma is the more versatile of the two. When pushed into distortion territory, both modules exhibit similar harmonics - I compared them visually using a soft scope. Otherwise, the Chroma can get the smooth relaxed vibe of the 1073 - at least enough to where I doubt many would be able to distinguish the two. At the end of the day, one IS the classic sound and one gets most of the way there. Both are great. The real benefit to the 1073 is the inductor based EQ which sounds fantastic but is an add-on module (at least for AML).
That being said, the Chroma is far more versatile even before the Colour slot or mode switching comes into play. There is more clean gain available and there are basic EQ options onboard that work well - again, straight out of the box without toying with Colour modules. If I were going to pick one, I’d take the Chroma hands down. If I were going to pick 2, I’d pick 2 Chromas. If I were going to pick 3, I’d get 2 Chromas and a 1073. You get the idea.