An aspect of breastfeeding that I seldom see mentioned is that the flow will be better, and both mom and baby will enjoy the time more, if the focus remains quiet, relaxed, and baby-focused. A baby who perceives "distraction" or "rush" or "anxiety" will simply not settle into nursing as well. If other loud or visually engaging entertainments are happening nearby, a curious baby will be drawn to those.
In fact, I was just listening to a radio interview on the topic of "multitasking." The social scientist who was interviewed noted that lots of moms watch TV or have other distractions happening during breastfeeding. The babies are also learning to focus early on those distractions. I've watched moms chatting on the phone, texting or working away on the computer with one hand while nursing or pumping, a situation that is not conducive to optimal milk flow.
So, if slower flow from the breast than the bottle is part of the reason your son prefers the bottle, a reasonable guess, you might look at the nursing environment and be sure it's focused on you and baby to the greatest degree possible. Soft lighting, soft music, soft touch, soft talk.
Alternately, some babies need a loud sound – like a hair dryer or vacuum cleaner – to get focused. They heard a continual, loud "whoosh" before birth, and most babies still find that soothing in their early months.
If your nursing times are filled up with any modern forms of busyness or distraction, I'm guessing it will enhance your enjoyment of your little guy's first year to arrange for a calmer time for the two of you to deepen your bond. His babyhood will go by so fast, and you'll never get it back again.
And if your nursing times are already very quiet, try the "white noise" approach and see if that helps. Blessings to you both.