Claire I'll give you my reasons why I ff:
I find the idea of bf repellent (completely irrational)
Anything touching my boobs makes me cringe a bit
I had nightmares leading up to birth about a bloody, mucus covered alien type thing being delivered onto my belly and then crawling up and latching on (actual, real dreams)
I was pretty scared in general about becoming a mum and fucking things up (I am a very 'in control' type of person), and by ff I knew I would be able to track how much I was feeding and would be able to have a routine of sorts (tbh the idea of haphazard disorganisation makes me very anxious).
I wanted my husband to be as involved with everything as much as poss, including feeding (but this was maybe as a result of all the other reasons I have already mentioned)
As it happened, both my babies had reflux and were very exhausting, and I had pnd with my first which went undiagnosed for about 4 months. I dread to think of mentally how bad I would have been if I'd been bf aswell - as it was, my husband was able to take a great deal of the strain off me which quite frankly probably kept me and my boys alive (dramatic, but I really think it to be true)
I have never felt any guilt about not bf my children, because I didn't ever want to do it in the first place, and the intention was never ever there anyway - but I do get mightily offended when people make comment about how it is "crappy" to do your child the disservice of choosing to ff "without even trying to bf".
I appreciate what you are saying about why you felt a bit weepy today and it was nothing to do with bf/ff, but this post is in answer to your question about why people chose the feeding option they did.