Yes they will be brighter than a 'standard' H4 bulb, as they're Xenon. But because the standard loom in your Golf is sh!t, you won't get the full benefit from them that other cars might. You can either;
Keep standard bulbs & uprate loom = more brightness (prob not lots though)
Uprate bulbs, but not loom = see above
Uprate bulbs & loom = now were talking! Should get good results
Uprate to 90/100 bulbs and loom = like looking into the center of the sun. Warning may cause blindness in other drivers
