They are esaier all round. They are wider at the top so is eaier to get the powder in without splilling onto side. It is easier to hold and for somereason they are proven to reduce colic. I cant recommened Advent enough, they are hard wearing and last for years!
yeah they dont make a lot of difference, i chose them for both of mine. avent ones are really good. i did buy other but tended to find they either leaked a bit around the teat or tended to wear out quicker.
I prefered the wide neck bottles- felt Joseph got a better grip on them to suck they were easier to store in the fridge and like Lauran said less messy when you put in the powder milk.
I too swear by avent I used the bottles, the bottle to cup trainer, the cup and the beaker
I found the wide necked easier for the powder, it didn't spill over the edges.
I didn't use avent but I used ASDA's own but they do tend to leak especialy if you don't get the top on properly! I have used Tommee Tipee bottles and found they were quite hard wearing.