Depending on what you post on dA, and the amount of work you're willing to put into networking, it can be very helpful.
When I was a teenager, most of my watchers were people who were into the same fandom as me. I didn't get much constructive feedback from them, although I did make some good friends.
Nowadays, my art is a little better, and I get a lot of GREAT constructive feedback from even greater artists. I don't post (much) of my comic there, but I do post related art that gets a LOT more lovin' than my comic usually does. And after a few years of this, I have a VERY encouraging following.
dA won't give you instant fame, obviously. And subscribers are much easier to come by here on ComicFury. So really it just depends on what you're willing to put into and get out of it.
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