As far as end users go .BIZ, except for quality hacks.
If you look at the Alexa traffic rankings -
.BIZ - 1000 sites in the top 286,000
.ME - 1000 sites in the top 627,000
It also depends on the term itself.
Love.me makes more sense than Love.biz and is worth more, but a commercial term like Landscaping makes far more sense in .BIZ
Brad
As far as that, you have to keep in mind, .biz has been around about 10 years and .me only 4. So those stats show .me is doing pretty good vs .biz
Also, just checked Alexa top 500 USA
.biz - 0
.me - 1
Hoster Stats for this year.
.biz + 34,278
.me + 46,390
And again, lot more startups using the .me domain. You simply have to read sites like techcrunch and such, I don't remember seeing any .biz but .me, yes and for business. Between those 2, the .biz is kind of "old" with .me the newer kid on the block that people are seeing more than the .biz with just how social the web has gotten in even just the last few years.
And you see stuff like this nowadays, that you won't see with .biz -
Silicon Valley Now Using ME Domain Names For Branding
http://www.adi-news.com/silicon-valley-now-using-me-domain-names-for-branding/26717/
Business is a lot more personal nowadays, so it's works for business as well.
How about sales? Just check year end for 2010 -
Highest reported 2010 .biz, .info, .mobi, .net, .org & .pro
domain sales through Jan. 2, 2011
http://www.dnjournal.com/archive/domainsales/2010/2010-final-ytd-sales-charts.htm
Only 1 .biz, email.biz $12,160, the others are doing better.
Looking at the cctlds, couple of .me for $26,000+ each.