I have seen so many times that systemd is insecure, bloated, etc. So i wonder ¿does it worth to switch to another init system?
This is a bit of a strawman. SysVinit is hardly the only alternative:
antiX: sysvinit and runit
Artix: openrc, runit, s6, and dinit
Chimera: dinit
Devuan: sysvinit (default), openrc, runit, sinit
Dragora: sysvinit + perp
Gentoo: openrc, systemd
Guix: shepherd
Hyperbola: openrc and runit
KNOPPIX: knoppix-autoconfig
MX Linux: sysvinit (default), systemd
Obarun: s6 supervision suite
Parabola: openrc, sysvinit, s6, systemd (default)
PCLinuxOS: sysvinit
Slackware: sysvinit
Stali: sinit
Void Linux: runit, openrc