What is the best way to load balance 3 WAN deferent speed?

what is the best scenario to load balance 3 WAN with deferent speeds?

https://wiki.mikrotik.com/wiki/ECMP_load_balancing_with_masquerade

Thanks a lot for your fast response.

One more thing If i want to publish device in local LAN for example “192.168.0.201” on port “4370” through “WAN1” and i want to make sure that this device will response output traffic just through WAN1 not through load balance. What will be best scenario?
Thanks again

Use mangle from marking packets from you lan (src-address-list) on out direction with routing marks and mark them in from outside to your router with conenction-marks. This described in link I post.