i have some of both and I use both. The reusable ones I have are so soft and are great if you're wearing nipple cream (my nipples tend to stick to the disposable ones some!) I like them especially for at night because they're softer and more comfortable.
However, the disposable ones I have are definitely more absorbent. I try to wear those if I'm going out in public or going to be around company right now - I learned the hard way when I started leaking randomly in front of some friends the other day and I had to run to the bedroom and change!
I wouldn't stock up- I bought some of both also and I never really needed to use them. I've leaked twice in the last two months.
I did need them to keep the nipple cream off my clothes in the beginning though- the reusable ones were awesome for that.
I use both. Cotton reusable when I'm home (usually) during the day, and disposable lansinoh at night and when I go out.
I like the disposables much better, but use the cotton reusable ones when I'm home because of the waste factor. What I hate about the cotton reusables is that if I leak once, even a tiny bit, they have to be changed because it doesn't wick the moisture away- your nipples just sit wet (gross!) I learned this the one and only time I wore them out of the house.