We use most things, we have AI2s, AIOs, pockets, fitteds, even have a few terries, thought I will be saving them for bump as they are too small for DD now.
More precisely, itti bittis, iish fly, blueberries, weenotions, bumgenius, fuzzi bunz, upsy daisy, dunk n fluff, fluff n stuff, holdens landing, flutterby fluff, muttaqins, jimmy riddles, hollow oak, lucy's hope chest, swaddlebees, erm I think that's it.
That's probably more confusing than helpful, I use fitteds if I know I'm not going to be able to change her in the next 3 hrs, she's a very light wetter though, compared to most 18 month olds, I use wool with all my fitted, I don't think I own a PUL wrap that fits her, though I used pockets 80% of the time as they are soo pretty and easy to use, plus easy for OH and my mum.
It totally depends on your LO, if she's a heavy wetter then I'd go for fitteds and wool, breathable and very reliable when the wool has been lanolised a few times, if not then pockets for ease, I wouldn't reccomend and AIO or AI2 for a toddler to be honest they just aren't reliable, my DS could out pee and itti in 2 mins.
I tend to try and support WAHMs as a WAHM myself, therefore they aren't the cheapest nappies, but they are IMO far better quality, and generally suit heavy wetter's better, with my DS I used all generic nappies and had to boost them so much he was practically wearing 2 nappies.
So basically, you need to work out your priorities, drying time, expense, reliability, cuteness, etc and take it from there, enjoy fluffy shopping!