This might be coloured by not having an equal basis of comparison, but for me, what I’ve found was:

I didn’t even notice there were themes in TFA until I picked up the soundtrack, but as I listened to it, the melodies became more apparent and I could recognize them.

For Rogue One I found I could at least recognize there was actually a soundtrack behind everything when I watched it, but I would be completely unable to actually recognize them.

If I got the R1 Soundtrack I might notice the individual themes a little better.