well, I won't even get into the mac/pc issue, I use both, and both have their flaws (and both have serious ones at that), though the single biggest isssue between the two is simply marketing.
If the intent is to scan, Velvia is the wrong film for 99% of most peoples work, period. The single biggest issues are exaggerated color reproduction, inaccurate color response and poor scannability. (unless, of course, you have pockets full of money or a money tree in the back yard, drum scans are expensive as hell and why bother with 35mm at that point, might as well shoot 6x7 or larger to get a better gradation and tonal response) The newer C41 dyes are specifically designed for scanning, one of the advantages of C41 films are that the negative contrast and density is moderately low, and the print contrast is high, effectively compressing the data at capture and expanding it at printing, if you will.
I'm guessing, you're in your mid to late 20's top, art student or taking photography classes and/or learned alot of what you know online, right? It may be hard to fathom, but before you were born, I was shooting product for Fortune 500 companies, 70 hours a week, 52 weeks a year,with transparency film, in large and medium format. I probably shot more film in a month than you shoot in several years. (a restaurant style walk in freezer was our film storage area).
Spend some time shooting some of the newer C41 films, you may very well change your mind. (or if you prefer, stop drinking the Kool Aid and test for yourself, being blunt and to the point)
I rarely shoot trannies any more, and only a few clients insist on a film/digital shoot, as some of their fashion type work looks better on film. With the advantages that the new C41 films bring to the table, it's a natural, E6 films don't have nearly the exposure latitude, or dynamic range that the new C41 films do, something to think about when you have to get the shot, no ifs, ands or buts. (I don't ever relish having to pay the cost of a reshoot)
There are advantages to shooting digital, and I do use it more than I may let on, to me it's more of my red headed stepchild. Though I don't use a Dslr, as there are just too many compromises to work effectively for me in my workflow. Take a good scan back on a 4x5 camera,the lack of an anti aliasing filter is a huge advantage here (and the reduction or elimination in sharpening needed, as well as the obvious adjacency effects that come with it) and there is little to no post processing needed. Suddenly that 3 minute capture saves 10-15 mins of post time, seems like a net win to me, especially if you factor in the fact that either way, it typically takes anywhere from 1-2 hours to dress a set prior to shooting, a few mins additional isn't that big of a deal.