Multi link design setup

Good people of Fortinet community. I need some help in implementing a multilink failover setup. 

We have 2 main sites connected as shown in the diagram below

Both sites have WAN links on X1 with a failover Virgin link between sites. 

We currently route all traffic  on main site through X1: 195.57.84.0/24.

I want to set up in such a way that only web traffic on main site goes through X1. All other traffic (ipsec, dnat, snat, etc) goes through X2 VLAN 280: 195.57.85.150, but should be able to failover to X2 VLAN 110: 10.10.1.1 should VLAN280 goes down.

Would this just require static routes with different priorities and policy routes, or would putting VLAN 280 and VLAN 11O in SD-WAN be a better option? 

Your opinion is highly appreciated. 

Thanks!