solr-lucene AND vs "+"

[Jonathan Rochkind]

Using solr-lucene query parser, is there a difference between using 
"AND" and using "+" in querries like this:

1)   q= some_field:( one AND two AND "some phrase")
2)   q= some_field:(+one +two +"some phrase")

Are those always exactly identical in all respects, or are there any 
differences in terms of result sets, relevancy ranking, or potentially 
performance?

Thanks for any advice,

Jonathan