PLC based AGV system

Hai to all,

Dear friends I am new to this form.
I am going to do AGV project.
I need help from all expert's.

Help needed.

1.Which system is reliable. ( PLC or micro processes)

2.Which system is low cost( PLC or micro processes)


3.Which system is easy to troubleshoot( PLC or micro processes)
Expert's pls help me to succeed my project.

Thanks in advance.

VMS