Thanks for checking out both! It's really up to your own personal preference. On my Teachers Pay Teachers page, I have unit bundles and curriculum available for immediate digital download. After purchasing, you download a zip folder of every PowerPoint, interactive notebook, worksheet, resource, etc. The benefits to this is that you get everything downloaded at once, all organized into unit folders, which you can keep on your computer or a USB. You also can download any & all updates to them in the future for FREE.
Here on this site, you get access to all these same resources plus the online lesson plans on how to use the resources with links to videos and online tools that can't really be placed into a desktop folder. These are updated more often than those on TpT, where I update units once or twice a year. Each resource is downloaded individually as needed, however, not all at once. As long as you maintain your membership, you get access to everything! Should you cancel, you keep only files you downloaded, but will lose log-in access to the lessons and links. Hope that makes sense :)