I haven't tried any AIO's as I heard they take ages to dry (which is a problem here in winter) and I like being able to swap inserts in and out as needed to customise the nappy more as it just makes sense that the absorbency needed at one month will be different then what is needed at one year. The main OSFM's that I have are Itti Bitti Tuttos (AI2) and Issy Bears (Pocket) and I love them both. They fit my 5 week old since 2.5 weeks without leaks (inc. newborn BF poo), yet he leaks with huggies disposables often. The Issy's being a pocket can be bulkier than the Tuttos but I don't mind the little bit of extra padding on the bum, it just means I put him in 00 instead of 000. Out of all the brands I've tried these are the ones I'll be buying more of when I'm allowed to buy more. I also like the BBH Bamboo fitted, but the two step process of nappy then cover is too much for my husband lol.