CFG is in the process of playing catch up with a lot of the latest features added to other loaders, so if you stuck it out this long, maybe wait a bit longer before giving up on the idea of seeing new features finally added to it too.
That being said, currently GX is generally the leader of the big 3 loaders in terms of functionality cuz of blackb0x's efforts to integrate new features and other improvements, with perhaps some hiccups (for now) in terms of fat32 usb thumb drive compatibility and sd card loading, but I hope to see those get resolved in the not too distant future. And whatever other improvements get added to gx may find their way into the other loaders too since they're all open source. So basically you should be all set for most things (if not right now then soon) regardless of what loader you choose, even cfg, assuming nitro continues to integrate some of blackb0x's new stuff. This is why regardless of what loader you prefer you gotta love all of them. It's like android vs apple, while I prefer android I'm glad they've both got competition to push them to new heights and maybe copy some of the best features from each other... monopolies aren't good for innovation after all.
These days WFL and CFG are made better cuz of gx (not to discount the work done by fledge which obviously was also a big contributing factor), and back 10 years ago or so perhaps it was oggzee/cfg leading the charge in terms of new functionality/development.
The main disadvantage is that it's USB Loader GX, and not the superior CFG Loader. It's ugly as sin with hardly any features, and tries to hard to be the stock Wii system menu while coming off as a cheap Chinese knock-off.
sorry but I gotta disagree, you can argue you prefer the UI of other loaders over gx, but u can't deny gx has been a leader in terms of functionality/development the last few years. Even if you don't like it, no need to be so disrespectful and dump on it so hard. As someone who still occasionally uses cfg usb loader I'm grateful nitro has picked up development, but props still go to gx/blackb0x for pioneering so many of the features that are finding their way into all of the big 3 loaders
Edit: also, while I agree that the default gx theme might be dated and underwhelming to some, it's totally themable