Actually VXSbill is probably much larger than epoch and ccbill, and is more of a merchant account than a 3rd party processor so its probably not fair to compare them. We use VXSbill and find that the ratios are solid, support is top notch, and we love the option of being able to bill in Euros !
I still have a little traffic through verotel and they convert a tad better than ccbill and around the same as paycom.