The Sony MDR-1A and 100 AAP both spring to mind immediately as choices that will match the comfort of the QC15. They both have built-in mics for phone calls too.
If you’re looking for something cheaper, the Pioneer SE-MS5T is a good choice with a similar feature set.
If you don’t mind using a headset microphone, HyperX’s line of gaming headsets are all excellent choices that are also quite comfy.
If you’re after even more suggestions than that, you can always check out this article I wrote recently which mentions some other models…though not all of them have a built-in mic.
Comfort is the most important thing to look for in a headphone, especially if you’re going to wear it for long sessions. Sound quality is more of a personal preference. Headphones are usually either “warm,” which means they’re more bass heavy, or “Neutral/Bright,” which means they tend to lean more towards the treble. I can’t tell you what kind of sound you’ll like so you’ll have to experiment! The two Sony models I mentioned above are warmer headphones, as is your QC15. The MS5T is a brighter pair.
Hope that points you in the right direction! It’s an endless rabbit hole, and if you’re not careful there’s no end in sight, haha. Thanks again for reading!