Hi
I've used both the ME one-size and BBH. I personally prefer the BBH, but it's really an aesthetic thing, they both work well. It's best to try a few different ones out before you buy a whole bunch in any case, to be sure you're happy with them before you fork out lots of money.
BBh with the inserts combined with a wool cover are pretty good overnight, even for fairly heavy wetters. (note, these bamboo/hemp fabrics reach full absorbency after being washed a bunch of times, so they won't work as a night nappy right away)
hth