Surge brakes work by use of a telescoping hitch.. If the trailer "Pushes" against the tow vehicle, then the trailer's brakes are activated.
The friction type anti-sway bars work by not letting one side (or both sides) of the trailer "push" closer to the tow vehicle.
With surge brakes as the trailer wags (Sways) side to side the brakes would be activated, and when you stop it would tend to torque the trailer sideways.. Both bad things
Now: The advantages of electric brakes.....
Electric brakes of old were ON/OFF, or if they were "Adjustable" it was a manual operation.
Today's modern progressive/purportional controllers let you adjust the amount of braking power, relative to the tow vehicle's brakes.. This can be a big plus.
Plus the harder your stand on the tow vehicle brakes. the harder THEY stand on the trailer's brakes.. This too is a good thing.
PLUS... with electric brakes, you can often manually engage trailer brakes w/o affecting the tow vehicle's brakes.. This can be a plus as well.
I recommend them
Home is where I park it!