From what I read, the most important thing to look for in any extract is freshness. I'm sure lots of extract brewers have their brand preference, but if you ask your supplier how quickly he turns over his supply of any given brand of extract (and he's honest), then choose the one that he sells the most of. That way you get the freshest extract. If you're ordering online, you don't have that option. I don't know how much inventory turnover the big guys have, but I'm sure their customer service folks would be happy to field the inquiry.