I have no idea which is right for me. What are the advantages and disadvantages of both? Which do you like better?
Why not look at schools that give you some benefits of both? Schools in consortiums, like the five Claremont Colleges, those in the 5 college consortium in Massachusetts, or the Haverford/Bryn Mawr/Swarthmore grouping all would give you the benefit of a small schools with a larger number of class options and people to meet.
There have been many threads on this topic. Why not do a search and find them?
It would be a good idea to visit a couple schools in your area. Maybe visit your state flagship if it isn’t too far away, and check out a smaller liberal arts college. See what you think. Then you can expand your list once you have seen both.
I feel the same way. I’ve applied to both small AND big schools because I honestly can’t say “I’m not going to apply to this school because it’s small.” However, I won’t go under 2500 students…that’s TOO low for me. I don’t want it to be like high school where I know everyone. To me, that’s not my ideal college experience. I think that there are a lot of pros and cons for both, from social life to classroom environment and resources. YET, you can find some large schools still offering small classes, accessible resources, and even hobby-specific (or something like that) residential halls!
I lean to the side of preferring a large-ish school as opposed to a small, liberal arts school. However, once I get acceptances/rejections I will be able to visit those that I got accepted to and then REALLY decide based off of my visits. It seems that people tell you that you need to make a decision: big or small school. When really, maybe a school being “small” or “large” is not a deal breaker! There’s definitely nothing wrong with having size as a small priority. Like I said there are pros and cons, and I’m sure you’ll be able to make the best of it 
I guess once I’m in college I’ll REALLY be able to say what is great about a small/large school!
How clear are you on what you want to study? Larger schools will give you more choices if you change your mind. There might be more research opportunities at larger institutions, however, it is also likely your first year classes might be considerably larger. How important are major sports to you? Intramurals? Clubs? etc. Larger schools will have more choices, smaller schools will often feel more intimate and might give you more opportunities for leadership.
It doesn’t matter what I like better – what matters is which is right for you. My two children chose different sized schools (one mid sized university and one small LAC) and they were both extremely happy with their choices and both got great educations. I went to a large university and loved my experience. I’d suggest that you visit some different sized schools (small, medium, and large) and decide what works best for you. Think about other characteristics that may be important to you as well (to name a few things…greek life, big time sports, what you want to study, religious affiliation, urban/suburban/rural etc.).