After performing a research on internet about this I've found the following info:
* The audit for TrueCrypt ended on April 2, 2015. During this audit they have found low-risk vulnerabilities, including some that affect the bootloader full-disk-encryption feature, though there is no evidence of backdoors.
* Since VeraCrypt is currently less popular than TrueCrypt, there are 'less eyes' watching at the VeraCrypt source code changes and this means that they may introduce a few vulnerabilities.
* The increase in iterations to mitigate brute force attacks only affects performance. If you chose a 64-char random password, 1 million years of brute forcing or 10 million years is the same from a security stand point.
So it seems that people still prefer using TrueCrypt instead of VeraCrypt.