I've used Telex 750's, Telex 850's, Sennheiser 25-KA-V (ANR battery) and now using Bose A20's. I fly a Hawker 800 XP.
The 750's aren't ANR so they're out of the discussion.
The Telex 850s are marginally better but still they built to a price and whilst comparatively cheap, the quality of RT isn't a patch on the next two. I use these in the sim....
The Sennheisers are very good. A real jump in quality in both transmit and receive. Worth the money but I found as the flying days were getting longer I was still getting fatigued by noise.
Now I use the Bose and I won't go back to the others. Yes, very pricey but what value is your hearing? They are so quiet. Really good audio. I can hear the ATIS clearly when my colleagues cannot. Highly recommended.