Young, welcome to Greek Chat. Call the office of Greek Life at your university and ask what fraternities are represented there. Ask for any information about fraternity recruitment to be sent to you.
Here on Greek Chat, we don't "rank" fraternities as "best" and "worst"-- 1) it's not our place to do this, and 2) reputations of fraternities vary from campus to campus and even vary on the same campus from year to year. Also, "beauty is in the eye of the beholder." Everyone on here believes his fraternity is the best!
It was the right choice for him! Go through fraternity rush to find the best choice for you!
To prepare pre-college-- Look online-- many of the groups represented on your campus have websites. They list their accomplishments and mission on these sites. You'll get a feel for the chapters. You can also look at the national websites (the chapter of "XYZ" on your campus is just one branch of a large organization of many collegiate chapters and alumnae chapters). There may also be "local" fraternities who exist solely at your university, and are not affiliated with a national group.
Go through fraternity rush-- this is their membership selection process where you get to meet men from all the chapters, get a feel for who they are, their accomplisments and interests. This is the best way to find the "best" fraternity on campus-- it is the one where you feel most at home with the members and feel like you fit in. If the members feel the same way, they will give you a bid. Rush is a bit like an informal interview. You'll be asked why you want to join a fraternity, your interests, goals, etc. It's a great way to make friends and get a feel for what Greek Life is like.
In additon, there are Greek Organizations that are co-ed or male only that have a focus on one area-- like a business or music fraternity, community service, honor society, etc. Check these out, too. They will have their own separate membership selections from the fraternity rush at your school for the other groups.
Good luck! As you're still in high school, enjoy your senior year-- make good grades, get involved with a campus activity, do community service-- these things will make you a more well-rounded person and attractive to the fraternities at rush.