This paper presents a comparison of numerical results obtained by two different approaches, the sectional methods and finite volume methods, of solving population balance equations. In particular, the cell average technique, recently proposed by the authors [J. Kumar et al. 2006, Improved accuracy and convergence of discretized population balance for aggregation: the cell average technique. Chemical Engineering Science, 61, 3327-3342] and the finite volume scheme developed by Filbet and Laurencot [2004, Numerical simulation of the Smoluchowski coagulation equation. SIAM journal on Scientific Computing, 25:2004-2028] are considered. The advantages and disadvantages are pointed out between the two different approaches of solving the population balance equations. It is concluded that the finite volume scheme predicts more accurate results for particle number density on fine grids, on the other hand quite reasonable results for number density as well as for its moments can be obtained using the cell average scheme even on coarse grids. (C) 2008 Elsevier B.V. All rights reserved.