How do i say this sentence in japanese?

Question:

How do i say

"I have never seen this before! Mine is better though." in japanese?

Thank you :D

Answer:

"I have never seen this before!
これは見たことないですね。
kore wa mitakoto nai desune.

>Mine is better though."
私のものの方がいいですけど。
watasi no monono hou ga iidesukedo