well, each birth for each woman is different...depends on so so much !
i would say, that on the whole, the one thing that sometimes seems to follow, is whether your babies come early, late or on time, but of course there are exceptions
my mum had me & my twin sister, 6 weeks prem, i was a footling breech, my sister was face up, and we were born vaginally ! and my brother was born vaginally, but mum had quite a hard time of it
i had two singletons, first was a failed induction resulting in a c.s, the second was a spontaneous labour ending in VBAC
so nothing like my mum at all
my twin sister had her first baby last year, 2 weeks early, good relatively quick vaginal delivery with no complications ! !