Canon rf 15-30 is better than rf 18- 150.

In canon's RF lens series, RF 15-30mm f/2.8L is USM (abbreviated as RF 15-30mm) and RF18-150mm f/3.5-6.3 is STM (abbreviated as RF/6.3).

If you need a wide-angle to medium-focus zoom range and pay attention to high quality and professional shooting experience, then RF 15-30mm may be more suitable for you. With a large aperture (f/2.8), it is suitable for low light shooting. It is equipped with Canon's latest image stabilization technology (IS) and ultrasonic motor (USM) to provide more stable shooting and fast and quiet autofocus.

On the other hand, if you pay more attention to portability and want a lens to cover a wider zoom range, RF 18- 150mm may be more suitable for you. Wider zoom range, from wide angle to telephoto, suitable for daily shooting and travel photography. In addition, it IS equipped with image stabilization technology (IS) and silent motor (STM), which can provide stable shooting and smooth autofocus.

It should be noted that RF 15-30mm is a professional lens with high price, which is suitable for professional photographers or photographers with specific needs. And RF 18- 150mm is more suitable for daily use and travel photography.

Generally speaking, which one is better depends on your needs and budget. You can weigh the characteristics of these two lenses, consider your own shooting style and preferences, as well as the expected use of the scene, so as to make the most suitable choice for you.