Hey Khushboo. Kuta is generally preferred by travellers as it is cheaper than Seminyak. But other Seminyak is a very happening place with many exciting beach bars and pubs. And no, it is not far away from places to see and chill at at all. So go for Seminyak!
I hope you have made your trip. It would be helpful for travellers if you share the travel details:
1.Route
2.Transportation
3.Weather
4.Budget
5.Places to see
6.Tips for travellers etc.
Happy travelling.