There are two 7th moves possible for Black in the Cambridge Springs move order after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa4 7.Bd3

Anyone play this line?

If so, do you prefer 7...Ne4 or 7...dxc4 and why?

Not Bb4? Or Be7?

Who plays 7 Bd3?  It's a minor sideline because it doesn't really offer White any chance for advantage at all.  Either ...Ne4 or ...dxc4 are fine for Black.  This is the sort of move that tells you White isn't familiar with the Cambridge Springs at all.

7 cxd5 is the safety play, and White generally scores pretty well with it, although there is no obvious reason for that.  The old Main Line is 7 Nd2 Bb4  8 Qc2, but Black has had resources there, too, for the last hundred years or so.