TLDR: AMD significantly outperforms Intel in absolute performance and performance per watt; battery life is about equal - depends on implementation and how its measured (Intel is still a little better on idle, video playback, but much worse under load), temps usually limited by laptop's thermal solution, but under high TDP, favors AMD.
The Tiger Lake U chips should be pretty competitive with Renoir at 15W, especially as there are almost no AMD options paired with 16:10 or HiDPI displays - we'll have to see when they come out. Tiger Lake H isn't expected until Q1 2021 and will have to compete with Cezanne (Zen 3 core, which is expected to have some pretty big IPC gains).
Lenovo IdeaPad S540-13: https://next.lab501.ro/notebook/english-lenovo-ideapad-s540-...
Lenovo ThinkPad 14s: https://www.notebookcheck.net/Lenovo-ThinkPad-T14s-Review-Bu...
XMG Gaming Laptop comparison: https://www.techspot.com/review/2075-same-laptop-different-c...
TLDR: AMD significantly outperforms Intel in absolute performance and performance per watt; battery life is about equal - depends on implementation and how its measured (Intel is still a little better on idle, video playback, but much worse under load), temps usually limited by laptop's thermal solution, but under high TDP, favors AMD.
The Tiger Lake U chips should be pretty competitive with Renoir at 15W, especially as there are almost no AMD options paired with 16:10 or HiDPI displays - we'll have to see when they come out. Tiger Lake H isn't expected until Q1 2021 and will have to compete with Cezanne (Zen 3 core, which is expected to have some pretty big IPC gains).