To put it simply:
This is according to ariesrising's site
Top 5 Fraternities in # of Chapters
1. Kappa Alpha Psi
2. Lambda Chi Alpha
3. Tau Kappa Epsilon
4. Sigma Phi Epsilon
5. Kappa Sigma
Top 5 Fraternities in # of Initiates
1. Sigma Alpha Epsilon
2. Sigma Phi Epsilon
3. Sigma Chi
4. Lambda Chi Alpha
5. Tau Kappa Epsilon
Top 5 Sororities in # of Chapters
1. Chi Omega
2. Delta Zeta
3. Zeta Tau Alpha
4. Alpha Phi
5. Delta Gamma
Top 5 Sororities in # of Initiates
1. Chi Omega
2. Zeta Tau Alpha
3. Pi Beta Phi
4. Delta Gamma
5. Kappa Kappa Gamma