Tiger Lake H is indeed a good alternative to AMD if you only look at performance in silo. These are the issues I see with Intel's offering,
1. Price - At comparable performance to the Ryzen 5000 series, Intel is unlikely to match in price. The board itself to support the higher power draw will cost more, even though they may offer things like TB connectivity
2. Much higher power consumption - Its obvious that Intel is designing 10nm just like their 14nm, ie, built for speed but at the expense of power draw. Like for like in terms of battery, I believe AMD systems may last longer,
3. With point 2, Tiger Lake H laptops may be harder to cool. So performance difference between systems is likely going to differ quite a bit depending on the cooling solution.
Overall, I objectively I would say that Tiger Lake H is certainly a good product and a good competitor of AMD Ryzen 5000H series.