I've only used 3 different wheels (if you count stock rup wheels) and my favorite are VertX wheels, they are really nice and super durable. Mine have barely wore down and I've had them for like 3 weeks or more.
Madd gear stock wheels, demon wheels etc out of them i reckon my mates wheels are best - phoenix 110 mm wheels - its lovely and smooth. extremely durable, riding on same set for weeks
i said demon because i like soft wheels but iv ridden my friends phoenix wheels and they are extremely smooth. i wish i could try proto wheels now that i see so many people like them