Imo BT 5.0 is far from what it can and should be for headphones.
The main differences between Bluetooth 4.2, Bluetooth 5 has:
2x the data rate....pointless for headphones as streaming rate is not the same as data rate.
4x the range...also moot because in order to achieve a longer range you charge ge the data rate and since most headphones can only stream to a certain degree, range is only slightly increased.
8x the broadcast capability, the biggest benefit of 5.0 cannot fully be realized with headphones as it's mainly recieving and not transmitting.
Battery life is another added bonus, but that's only if implemented by manufacturer. So realistically 4.2 will perform near identical to 5.0, just minor differences to set it apart.
But I do agree with the Spirit X for its sweatproof design and longer battery life. If only used for music and occasional podcast,otherwise the Arc is better suited for phone calls and podcast.
The remote play button on the spirit x is flush with the other buttons maki g it hard to just grab and select the right button,where as on the Arc, it is also raised but is designed differently from the other two so you literally can grab it and know what button your pressing without having to feel for it.