R7-3750H is slightly slower than i5-9300H, not even compared with i7-9750H. Has some limitations like single core performance (it's still Zen+), less PCIe bandwidth etc. Wait for Ryzen 4000 mobile better

AMD GPU still has a long way to go, not just driver side but also efficiency (they still haven't figure out how to optimize power in laptops)

If you want 2060 laptop under RM4.5k, either go for Lenovo Legion Y540 15 customize (apply code LENXCIMB) or Commandos Glock 5 Alpha. However you probably won't be able to get 144Hz IPS which is a must IMO for such GPU

However, depending on the games and video settings you play, you might lose some frames compared to i7+1660Ti

Both have their own pros and cons (looks, weight+dimensions, desktop CPU, onsite warranty etc)

If the games you play are CPU heavy then I would suggest i7+1660Ti instead