Like a lot of others, I use Aldi during the day but definitely Pa, pers at night - the only time I tried Aldi at night, my baby was soajed right through the nappy, clothes and bedding within 5 hours. This has never happened with Pampers, even those miracle nights when he sleeps through, or the nightmare nights when he demands two 8oz bottles overnight.
Having said that, I do find Aldi by far the best of the cheapies and as I don't like leaving him unchanged more than 4 hours in the day at most, I never have a problem with them. If going on a car journey or somewhere I won't be checking him regularly, I do use a Pampers during the day though, as in my experience they deal with poo better if there is any risk ypu won't notice it right away.
So if I had the money, it would be Pampers 100% of the time but I am happy with my budget compromise.
On avoiding nappy rash, I have only ever used WaterWipes and never had so much as a moment of nappy rash even during difficult teething periods; all my friends who have used them or switched to them say the same. They are very expensive but 100% worth it in my opinion. So save on nappies, splash put onthe Water wipes!