Bing Advertiser
316,160 websites

Bing Advertiser costs money

http://advertise.bingads.microsoft.com/en-us/help-topic/how-to/51049/how-can-i-track-conversions-and-other-site-activities-for-my-campaign

Bing Advertisers.

VS

LinkedIn Advertiser
347,806 websites

LinkedIn Advertiser offers both free and paid options

https://business.linkedin.com/marketing-solutions/conversion-tracking

Linkedin Advertisers, websites using Linkedin Conversion Tracking.

Market Share by Top Websites

1 LinkedIn Advertiser is leading in The Entire Web.

2 Bing Advertiser is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Bing Advertiser has better usage coverage in more websites categories. Including Lifestyle, Health, Vehicles, Travel & Tourism and 10 other categories.

2 LinkedIn Advertiser is leading in Computers Electronics & Technology, Business & Consumer Services, Science & Education, Finance and 6 other categories.

Geography

1 LinkedIn Advertiser is leading in most countries, including United Kingdom, India, Canada, Australia and 151 other countries.

2 Bing Advertiser is leading in United States, Germany, Taiwan, Japan and 5 other countries.