Wireless or QoS next to study?

Robbo777

Hi, after finishing my CCNP R&S and covering everything that covers (which is pretty extensive), i then went onto MPLS and then ASA firewalls. After getting those 2 down for the most part (nobody can know everything i suppose), i'm still deciding on either to go with Wireless or QoS. My knowledge on both are limited especially what i'm comparing it to in the CCNP theory/labs i did.
I know everyone is different but logically what would be the best route to go down next and why?


Thanks everyone