Both of them are solving the same problem, eigenvalues and eigenvectors of a general matrix

I want to ask, in terms of computational time, which one is faster ??

also, in terms of performance, which one is better?

If I don't want to balance or permute my matrix(BALANC = 'N' in dgeevx ), then is dgeevx the same as dgeev ??

I am solving a second order linear ODE, which one should I use? dgeev or dgeevx ?

Thank you very much