As a typical non-Gaussian vector variable, a neutral vector variable contains nonnegative elements only, and its l1 norm equals one. Additionally, its neutral properties make it significantly different from the commonly studied vector variables (e.g., Gaussian vector variables). Due to the aforementioned properties, the conventionally applied linear transformation approaches (e.g., principal component analysis (PCA), independent component analysis (ICA)) are not suitable for neutral vector variables, as PCA cannot transform a neutral vector variable, which is highly negatively correlated, into a set of mutually independent scalar variables and ICA cannot preserve the bounded property after transformation. In recent work, we proposed an efficient nonlinear transformation approach, the parallel nonlinear transformation (PNT), for decorrelating neutral vector variables. In this paper, we extensively compare PNT with PCA and ICA, through both theoretical analysis and experimental evaluations. The results of our investigations demonstrate the superiority of PNT for decorrelating the neutral vector variables.