>>4096516this anon makes a good point for wildlife shots. im inclined to say it requires the most supplementary knowledge/ability (like survival skills and endurance for trekking, researching animal behaviour etc), financial investment, and decisiveness in order to come away with something others would consider worth the effort, so long as you're not simply snapping pics of a garter snake or a stray cat or something comparatively domestic.
next? maybe fashion/landscape/macro/portrait. landscape for the physical investment of hiking, timing, macro can also require a similar investment as wildlife and landscape depending on what the subject is. but id say fashion>portraiture absolutely.
music and sport would occupy the same tier. maybe music slightly over sport. i may be wrong but as its less dynamic than 20 dudes running around at the peak of their physical capability you're likely to have a harder time coming away with good photos.
architecture and travel may as well be the same thing, no? some of the most defining aspects of another country visually is in the architecture, or perhaps specific buildings/structures done in a particular architectural style. depends on where you are geographically i suppose.