Windows Defender Or Avast

I installed windows 10 and it has own anti-virus ( Windows Defender ) I installed a program and Windows Defender just blocked him by saying it contain a virus. Avast did the same job, its blocked the program and then remove it. So i have a question

Why would i chose Avast when i already have build-in ant-virus ? .

P.S I am facing some problems with Avast too Like its stuck while scanning my PC

Thank you

Well, avast has more features and utilities to protect your system than win defender.

Actually i don’t usually use other features except scanning downloadable files for virus. Do you still think avast will be a good choice ?

This subject is often discussed in this part of the Forum.
https://forum.avast.com/index.php?board=88.0

Also Avast v Defender relative performance can be seen on AVCompartives tests:
https://forum.avast.com/index.php?topic=221963.msg1561050#msg1561050