Lightspeed Zulu 4 vs. Delta Zulu—What's the best Lightspeed ANR headset for pilots?

Shop Zulu 4: https://www.sportys.com/lightspeed-zu... Shop Delta Zulu: https://www.sportys.com/lightspeed-de... We put the Lightspeed Zulu 4 head-to-head with the Lightspeed Delta Zulu. You’ll see the small but important updates on the Zulu 4, such as the longer mic boom and glare-reducing black finish. Plus three big extras that only come with the Delta Zulu: integrated CO detection, rechargeable batteries, and HearingEQity sound personalization. Both models carry Lightspeed’s renowned build quality and industry-leading 7-year warranty, but the Delta Zulu comes in about $200 more. Which one is right for you?