Reusables.
No crystals, and very very very few babies are bothered by wetness - it stays body temp, so not like its cold and clammy iyswim. If you can use fleece, then they stay all dry and lovely anyway.
I can't ignore the washing angle - no, no, no, no! With the right amount of nappies you wash every 3 days... 2 extra washloads a week. Also if you have the kind of child who leaks from disposables, then your washing isn't changed at all - you're just washing nappies rather than changing and washing clothes every few hours.
Compared to the amount of disposables one child uses in its lifetime, and what happens to them afterwards it is still more ecofriendly and the land is not being taken up with them.
One pack of brand name disposables is slightly less than one cloth nappy/wrap. If you were to use a birth to potty nappy and wash every 3 days that is about 16-20 nappies needed (depending on the type you use/how you dry etc) and 12 wraps in total (4 wraps of 3 different sizes).
You are going to get through many more than 30 packs of disposables before potty training, and you can reuse the nappies on subsequent children/sell them on afterwards.
I do agree to try out a few before settling on a whole load.
If you want to talk more about different types etc then feel free to email me bumfluffnappies at gmail dot com.