Yes, you will visually see a difference especially on deep sky. Fainter galaxies will come to view. Make sure you buy an instrument you can handle and use as much as the 15"...or at least keep the 'utility' question in mind. If you want to do imaging, you are going to spend a lot of money for a stable mount.
Also, if you go with a 20 or 24", you may want a small scope just for quick views on fair nights.
Also, if you go with a 20 or 24", you may want a small scope just for quick views on fair nights.
