Discussion successfully moved from Adobe Creative Cloud to Lightroom Classic CC — The desktop-focused app
I suppose you have currently a Lightroom 6 or lower version!
If you choose the Photography plan, you get Lightroom Classic CC and Photoshop (and Lr CC, the cloud based photo editing software).
Lightroom Classic CC works like you are used with your current version, except that you can synchronize some collections to the cloud, so you can edit them on a tablet or phone. Only "low res" previews are uploaded to the cloud, so 20 Gb is enough.
Lr CC uploads your pictures to the cloud and needs much more space. Hardcore photographers like me with 3Tb and more of photo data do not use Lr CC. Lr CC is quite nice for those on the road or taking pictures with mobile devices. It is nice to be able to upload the raw files at the location and being able to start editing immediately. I do not need that feature.
If you like you can take the Photography plan+1Tb of cloud space. If you do not use Lr CC that will be overkill.