I had a quick glance at the Phantom Help site featuring
Tablets and it looks like the 8+ has a faster processor (2.35 GHz) verses the tab 2 at (1.9 GHz) that may affect the performance. The 8+ is two years newer too.
Also, according to the colored dots, the tab 2 is not recommend by DJI to run the Go4 app. Go3 yes, but not the Go4.
Scroll to the far right of the
tablet list and click on the balloon for conversations (13) about the product and perhaps you can find additional answers to the problem and what others may have done to solve it.
You could try an OTG cable that may help in the lag.
You asked what is preferred, I know it hurts to hear this but it seems that Apple products work best.
I fly with a mini4 primarily via WiFi, but I have two Droids that I fly with sometimes via WiFi and had good performance with all three. Although the Droids can be a little finicky sometimes.
Samsung Galaxy S7 and Motorola Moto z2.
Good luck.