I've been with Alamy just over 5 years and have used both options and, frankly, have never been able to tell the difference in terms of volume of sales or income.
Maybe it's just my experience and the quality of my pics, but don't hold your breath on making fame and fortune from it. I've got almost 3500 images with them and have earned roughly the equivalent of a couple of lenses. There does't appear to be a big market on Alamy for u/w images. But, like i say, that might be just my images.....
Good luck with it!
Thanks for the info. My initial four pictures just passed QC and are online. Your camera/system and most of your pictures are much better than mine so I won't expect much, if anything. I am mostly retired but doing independent consulting about 20% of my time. Adding all those captions and keywords will give me something to do when I get bored but it would be nice to make a few $s so I could dive more often.