The Fujifilm GFX100/GFX50S/GFX50R were released a while ago and Fujifilm NP-T125 batteries have become scarce so if you are looking for a first party high-quality third-party option the hahnel HLX-F125 is probably the best on the market today. There are many third-party options today,but they can vary greatly in quality and they aren’t as well-engineered as the hahnel HLX-F125 which is designed to be a true first-party quality replacement. I plan to buy 4 of these batteries myself for my GFX100 because I do not believe I will be selling it anytime soon.
The Fujifilm GFX100 has also become an incredible value for a photographer since it has dropped from around $10k to 3-4k used from reputable shops like B&H Photo.