My favourite braid is the Daiwa braid in x4, however I only use that one in 6 and 8 pound on 2500 reels, and I use those regularly. I get it off fleabay, mainly as my shop doesn't stock that brand, and it's convenient to have it arrive at home, I have a new/spare x8 variant to try in the boat.
Berkeley braid in 12lb is on one of my 4000 reels and I hate it, it's too stiff, colour faded fast and a real pain compared to other brands.
Power pro is on my Sustain 5000 in 20lb, it's a bit stiffer than I expected but have hauled some decent fish in on this 20lb setup and never had an issue. I get that when my local shop has 20% off sales, or off fleabay, it gives me that good brand name feeling but I'm pretty sure it's not worth the RRP cash!
For heavier setup's I have used the Chinese braid with good success, can't recall the brand but I've been impressed with it and not had any failures in a couple of years. I google forums for what was working for people and went with the majority, some Chinese braids have some classic names 😁. The cost makes it easier on the pocket when spooling 300-500m of braid, you can load the whole reel without spending $100 or worry about knots and weak points.
I did have some issues with a fluro carbon labelled Japanese something off ebay, it's still in the naughty corner in the garage after I lost a larger flatty at the net on the 30lb variety.. 😪