Here is a summary of the most important differences:

Design & wearing comfort:

Sony LinkBuds: Have an open ring design with a hole in the centre so that ambient noise can pass through easily. Some find them very comfortable, others report that they don't fit every ear shape perfectly.
Bose Ultra Open Earbuds: Utilise a rolled earpiece design that sits over the ear canal. Many users find them more secure and comfortable to wear.

Here is a summary of the most important differences:

Design & wearing comfort:

- Sony LinkBuds: Have an open ring design with a hole in the centre so that ambient noise can pass through easily. Some find them very comfortable, others report that they don't fit every ear shape perfectly.
- Bose Ultra Open Earbuds: Utilise a rolled earpiece design that sits over the ear canal. Many users find them more secure and comfortable to wear.

Sound quality:

- Sony LinkBuds: Clear highs and mids, but little bass as the open design does not provide deep sound isolation.
- Bose Ultra Open Earbuds: Better bass response thanks to Bose technology, resulting in a more powerful sound.

Additional functions:

- Sony LinkBuds: Adaptive volume, voice control, compact design.
- Bose Ultra Open Earbuds: "Immersive Audio" mode that improves spatial sound.

Price:

- Sony LinkBuds: Less expensive, a good choice for price-conscious buyers.
- Bose Ultra Open Earbuds: More expensive, but better sound quality and fit.

Conclusion:

- Bose Ultra Open Earbuds are better if you want more bass, a secure fit and better sound.
- Sony LinkBuds are ideal if you're looking for a lightweight, affordable model with natural sound.

Otherwise, I can also recommend comparisons on YouTube.