My primary pilot loadout is EVA-8 shotgun (leadwall), B3 wingman, Mag Launcher, frag grenades, stim, power cell, and minion detector. The shotgun in Titanfall is a beast, and even with the leadwall it still one-shots enemies most of the time. The stim + Power cell really helps get in close to the shotgun's ideal range. This loadout just really suits my reckless playstyle, and I've been using it (or at least, a build close to it) since the beta.
My main Titan loadout is Stryder titan, 40mm cannon (extended magazine), electric smoke, cluster missile, nuclear ejection, and survivor. Honestly, this loadout could use some work, as I don't really accomplish much with the nuclear ejection or survivor perks. That being said, 40mm cannon is definitely my favorite titan weapon, and electric smoke is handy against pesky pilots. I also really like the cluster missile, as it is great against pilots trying to hide in buildings, and does a surprising amount of damage to titans.
My secondary Titan loadout is Stryder titan, Triple threat (extended magazine), electric smoke, rocket salvo, dash quickcharger, and big punch. This loadout is designed to get up close and beat the snot out of other titans. I've had mixed success with it, and it is a really gimmicky loadout. But I have fun with it, so there's that.
P.S. If you get the burn card that grants unlimited invisibility, make a pilot loadout with a silenced submachine gun and the enhanced parkour kit. Then just wallhang near a point in hardpoint, and watch as you single-handedly protect that point for the entire match. Cheap as hell, but really fun.