I've only tried the first, and loved the hell out of it. Been meaning to buy the second, though I bought the Warcraft 3 Battlechest instead ($20 more), and regret it as it lags on my computer. Same goes for Guldwars, lag lag lag lag lag.

I do plan on buying it though.

Edit:
Never played online though. Though I don't have my guys anymore as I couldn't get it to work one day and reinstalled it, only to copy over the old game to find out that it was still there after I deleted both on accident, or something to that extent.