Well, streetglow is the original, so I'm assuming that quality is going to be better. But when it comes to LED's, correct me if i'm wrong, but all LEDS have the same brightness. So either way you're cool.
Im going to have to disagree. Varad has had there LED neons out longer. Street Glow developed them after many people starting buying Varad's LEDs. Varad are bright i have them. The can do all sorts of strobes, fades, chases, and effects. Also they are more durable than regular neon because they are more bendable and have a thicker coating to protect them.