Arc strider is 1 of the best add clear,last long do way more damage than another add clear (2 light 1 heavy combo)
You know focusing lens work that other light ability do more damage when target is affected with stasis and it's the others that need to equip it not the stasis user
Also stasis is a great clear room super while you can still use your regular weapon
Missile titan do more damage with the chest than GG with nighthawk BUT as I said GG is faster and safer..since you don't need to be next to the enemy
Arc strider is pretty mediocre and at best its pretty much on par with other roaming supers, which doesn't make it one of the best really. Yes focusing lens works against enemies affected by stasis I mean, by now I think everyone knows that. However the effect of squall as a debuff during any dps phase can just be substituted by a grenade, sure it lasts a bit longer but that's about it, its not really worth to bring a hunter just for that.
As for goldie, missile titan does a lot more damage than a GG, as for it be it safe its very debatable, missile with the chest is fairly safe, even if you end up next to the boss you have an overshield and it's pretty hard to die off it, unless you decide to stay there.
Goldie unloads faster, that much is true, but on the other hand it ends up being harder to use on certain enemies with small crit spots, like atheon for example, while you don't have to worry about that with a missile titan.