Amazona has a German-language review about the One Compact now. It‘s a bit mixed, they say the mid frequencies are not very clear.
Google translation of the summary:
verything is in there again and it is difficult to draw a conclusion. I try to split it into several parts. Let's say I need a box that I can quickly and flexibly put somewhere so that a little background music sounds at a reasonable volume and I want to be able to connect four of them wirelessly. The JBL EON ONE Compact is top for that. Or I travel to markets or the like and need a light box with a long battery life to which I can connect my microphone - also great. Or I make music in the pedestrian zone and need multiple inputs and a USB power source. If you don't value absolute hi-fi sound - it's great for that too. You can also sit comfortably on it. But if I now want to listen to electronic music at high volume, for example, or attach great importance to the playback quality, I would rather look elsewhere. The weight / volume / battery life factor is great. For that there are drawbacks in the exact music reproduction.

https://www.amazona.de/test-jbl-eon-one-compact-aktivbox-mit-akku-betrieb/

There are also a few reviews on Thomann now stating that the Bose S1 appears clearer in sound to them. So it‘s a matter of taste, probably some like the JBL‘s deeper bass better, for some the mids are clearer with Bose.