HA between sites MPLS vs. OTV

Hi all, I am trying to figure out the best approach here. I have two sites, Primary and DR. I have an HA pair of Big-IPs at each site. My goal is to setup config replication between Primary and DR to keep DR HA pair "warm". I am currently reviewing two options.

1. Stretch HA VLAN From Primary Site across OTV to a DR site and use same subnet at DR site for HA.

    

2. Create separate HA VLAN at DR site and have Primary and DR HA networks rout across MPLS.

    

Trying to think of any gotchas, pros and cons. Any input and opinions would be greatly appreciated.