Yep, I meant any other trackable channel. For example, DCM right now tracks ad data, but it also seamlessly integrates with GA (and GA Premium). From your site it appeared you just did the ad tracking bit, so I'd want to know how you're baking in other channels (organic, affiliate, email, etc.) and it sounds like for the most part you rely on explicit tagging (which unfortunately doesn't always do it for organic and referral).
Beyond that, until you come out with an algorithmic attribution solution, you really should say more on your site about how you differentiate from GA. Right now I can upload all my cost data, etc. from other engines with no problem, so GA in theory does all of this, and has attribution tools.
Interstate already tracks non-tagged data in the same way GA does.
The GA Model Comparison Tool is great for the basics but I'd hardly call it a comprehensive attribution solution for static models. Even if you import spend data (which you have to do manually), you can't get any sort of understanding of what payback periods actually were, just present day ROAS and how it differs by model. You also can't see revenue, spend, and # of attributed conversion in the same report, filtering is a pain, etc etc. It does the basics but not much else.
Beyond that, until you come out with an algorithmic attribution solution, you really should say more on your site about how you differentiate from GA. Right now I can upload all my cost data, etc. from other engines with no problem, so GA in theory does all of this, and has attribution tools.