webjames, it depends on your philosophy, especially now that Photos is non destructive. LEt me work through a couple of examples:
1) Your life is mostly iPhone centric, cataloguing is less important than faces and places
Perhaps you use your iPhone for a majority of your snaps/quality snaps and bring out a better camera only occasionally. Even then, you're quite happy to use Photos to import from that camera and do basic editing in Photos (which is a lot less basic than it used to be in iPhoto)
Every now and then you do a special shoot and enjoy editing in LR.
Then you make Photos your main catalogue and export high quality jpegs from LR into photos. You only use LR for 'keepers' and perhaps to store originals of RAW shoots as they would take up too much space if you use iCloud
2) You use a combination of cameras/image sources and need cataloguing to find your way around. You're happy to use your i-devices as a combination of snaps/showcase
The first thing to do is to decide when to leave your snaps alone and when to organise them. Let's assume that you're going on holiday in sunny Spain and you collect pictures from your DSLR, your phone, your friend's phone etc. Here is my workflow:
- Import memory cards into LR using a preset renaming
- Do the same with 'i-images' but once in LR, apply a colour flag so that you know which is which
- Run through your keepers to cull your photos, then keyword and edit to your heart's content
- Run another coloured flag on any picture that has been edited (even if just for cropping)
- Then export those edits to disk, but export the unedited i-images as originals (save for the renaming)
- Delete originals from your phone
- Import this 'show library' to your devices/iCloud
PS: the reason for the coloured flags etc. is that if you re-export jpegs from LR they may degrade and they are much larger than the originals (no idea why)
Hope this helps...