Becky, do what's right for you. We can dispense suggestions, but we really don't know what your circumstances are; and what you'll need and want as you travel around the globe. There are many options for accessing money; some are better than others. You'll have to decide whether a small advantage in the exchange rate is really worth it, particularly if small sums are involved. There is no right way; and wrong way. It all depends ...
I travel a lot, but perhaps not as much as OldPro and others on this forum. But I am familiar with international finance and the global banking system. The VISA network has substantially more cash machines; and that's a distinct advantage when traveling around the world. The more access points you have, the better.
Some like to use prepaid cards; that's fine. They feel comfortable and secure using a familiar product. For myself, I sometimes wire funds aboard, particularly when necessary and prudent; and when large sums are involved.
I participate in these forums in the spirit of "caring and sharing," part of the motto in my Travellerspoint profile. I hope you'll share your travel experiences as you make your way around the world. We can learn from them, too.