Hi Andrew,
As you listen to the A & B sections, you will probably find that in most cases the B section is a little more....ummm... busier, with more happening. I tend to use the B section as maybe the second "verse" with a change of instrument and a slightly more energetic backing. I prefer to lay the whole song out without repeats - just my opinion - as it seems to be easier to manage (you have up to 255 bars - about 7 minutes at 140 bpm, so normally no need to use repeats.)
As "Sultans" doesn't really have a chorus as such, I would probably use "A" for the first & second times through, & "B" for the final time.
Try it, and see which you prefer - remember, it's YOUR song now.
Good luck, mate. If you have any problems, PM me, and I'll do a quick arrangement for you (but after New Year, please, I'm on holidays until then - heading up your way for a week)

Cheers,
Keith