TIFF is not better than RAW, not in the least. TIFF is basically an uncompressed JPEG with very slight real-world benefits over JPEG with all that extra file space needed to store it. RAW is a whole different world, with lots of adjustments that can be dealt with after the shoot in a controlled environment.
It takes a lot more resolution to make a good image from a decent (not drum, anyway) scan versus from a digital camera. And megapixels aren't megapixels, but comparing at least DSLR to film
Where the proverbial rubber meets the road: I got pretty decent 8x10 prints out of a sharp 35mm slide with a 2700dpi scanner. That's almost 11 megapixels. I have sharper 16x24 prints from a 6mp DSLR.
PS - "Argentic" is my new word of the day.