Teachers Pay Teachers is a third-party site and Feel-Good Teaching is my own site. Whether you purchase on TpT or FGT, you will receive the same resources with lifetime updates for free.
The prices are the same on both sites, but I do pay a commission to TpT for resources sold on their site. In addition, if you are signed up for the newsletter, I often send freebies and coupons that apply only on the Feel-Good Teaching site, because I have more flexibility there with the kinds of sales and promos I can run.