With so much to offer and comes only for under the price tag of 30k . Yes according to my experience oneplus 3T is best I used .
The phone comes with host of features like
6 GB of RAM , 16 MP front camera and rear camera which gives a phenomenal photos ,
with a display of 13.97 centimeters ( 5.5-inch) Optic AMOLED Full HD capacitive touchscreen with 1920 x 1080 pixels resolution and 401 PPI pixel density
which makes everything so bright and full of colour , its a fantastic processor i.e. Qualcomm® SnapdragonTM 821 MSM8996 Pro ( 2.35 GHz) quad core processor, and a battery of 3, 400 mAh lithium-polymer battery with dash charging which can charge in half an hour , The phone has a metalic body giving it more premium look and finish.
It your budget is around 30k you should go for onepluse 3T .