Reels/ Shorts are short vertical video format which is a great way to reach to target Gen Z audience. Various platforms have different features embedded to them.

On Instagram, Instagram reels are extremely popular way to reach out to millions of potential users and you can add custom music, stickers, labels and so much more. Instagram offers huge number of options and is most evolved of all.

Duration of a Instagram Reel video is 90 seconds.

On YouTube, this format is YouTube Shorts which are very addictive and offers great way to push out short, vertical format videos. As YouTube shorts videos are short in duration, users keep on scrolling through and hence huge number of views are received by videos that goes viral. 

Duration of a YouTube short video is 60 seconds. Any vertical video having length more than that is a normal video (and not a YT Short) which means it won't enjoy the benefits of getting included in the YT Shorts library (which is a great way to get instant traffic to your videos).