Hi Pebble!
I also have to use ear buds for anxiety and managing the sounds around me. I’ve only tried two brands since they can all be so expensive but here is my experience
Loop - these were some noise cancelling ear buds I found on Amazon. I didn’t find these to block ANYTHING, everything was still very clear even with the ear buds in. I think they cost me around £30 so I was so disappointed with them. They came with different bud sizes but every one of them was still too big for my ears, personally. And after a while they got really uncomfortable with the hard plastic ends constantly digging into my ears.
dBud - I do like these ones, though they don’t block out the louder noises and chatter for me. They have adjustable sliders which is good if you need to be a little more aware of your surroundings, and come with a strap that goes around the back of your neck. There’s a magnet in the buds so when you’re not wearing them they just clip around your neck like a necklace which has been good when I’ve needed to put them in and I’m in a rush. My only problem with that is the fabric back can sometimes play on my sensory issues.
Obviously these are two very biased reviews but I do hope they help you, as well as anyone else looking for a solution!