<p>if most students are getting a letter of rec from this one well known teacher that writes about 40 recs every year, but i get my rec from another teacher that knows me much better than that well known teacher, and can more time with my letter than that well known teacher can, will my letter of rec be better?</p>
<p>You definitely want the rec from the teacher that knows you better and will be able to make it more personal/detailed</p>
<p>Of course the letter will be better. The teacher has more time to craft a personal letter and knows you more, so it will generally be better.</p>