Victoria Brampton AKA Lightroom Queen has a nice flowchart and feature comparison as well as answering questions on her forum. I have already figured out that I will use lightroom Classic plus collections to sync what I want to the cloud as well as syncing from my phone to the cloud when I see a benefit.
https://www.lightroomqueen.com/lightroom-cc-vs-classic-features/?utm_source=The+Lightroom+Queen&utm_campaign=4f3bb025b1-LR7_Newbies&utm_medium=email&utm_term=0_17d5f8afbe-4f3bb025b1-341004953&mc_cid=4f3bb025b1&mc_eid=1f29fa0687
https://www.lightroomqueen.com/lightroom-cc-vs-classic-features/?utm_source=The+Lightroom+Queen&utm_campaign=4f3bb025b1-LR7_Newbies&utm_medium=email&utm_term=0_17d5f8afbe-4f3bb025b1-341004953&mc_cid=4f3bb025b1&mc_eid=1f29fa0687