Pastor David Wayne (the "Jollyblogger") shares some good and helpful thoughts about seeing "devotions" as spiritual disciplines, as opposed to means of grace. At no added cost, he speaks of the priority of the corporate worship over private devotions.
On the latter: in the comments section, I register some hesitation. Insofar as he is restoring our valuing of corporate worship, and not thinking of it as an intrusion or an optional extra in relation to private worship, I'm right there with him. But I wouldn't actually rate either over the other. I think if you're doing either right, it helps you do the other right; and vice-versa.