The new audio codec should be of a much higher quality, though it does match what some proprietary systems have already been doing. Not just "quality" improvements, but the tinny aftertones and so on should just about vanish in all circumstances. Normalisation will work better. It'll be easier to pick out voices in a crowd, etc.

BLE should be much lower latency. Potentially anywhere between half and a third. Which should be a huge quality-of-life improvement for those using bluetooth hearing aids.

BLE is _somewhat_ simpler, and has decent adoption throughout the software industry. So connecting to Windows, macOS, Linux should be possible. (The Linux story is complicated by the new audio codec - its nonfree and patent encumbered). If they've done their job right, you'll be able to connect your hearing aids like any other output device, with a quick and simple pair from whatever Bluetooth menu.

However, BLE is also known for more frequent dropouts related to battery usage spikes. Not directly because of the spec. Because the people implementing it have done a worse job thus far. If that remains the case, then it is fairly useless as a hearing aid tool.