Linux PREEMPT kernel

What are the advantages / needs of running asterisk 14.2 on a SMP PREEMPT Linux kernel (4.4.36 or similar) versus running on a SMP (not PREEMPT) kernel when using SIP (no DAHDI or other hardware)?
What are the potential challenges when switching to a non-preempt SMP Linux kernel in the above asterisk 14.2 configuration? Are there any?