What do I gain from getting newer hardware than D3.3?

I currently have D3.3 and am wondering whether never hardware would make a difference in for example approximation accuracy / RSSI / Db ?

What basically is the difference?

Thank you

The only difference between 3.3 and 3.4 (i.e., the latest version) is, 3.4 employs a bigger battery (1000 mAh vs 650).