Which email address should a student use in a publication?
It depends on many things, which I tried to order by descending priority:


Possible journal policy: in most cases, they don't have one
Possible employer policy: my own institution forbids the use of gmail.com addresses in lieu of our professional ones, because of a national policy forbidding use of commercial email providers for state-paid positions (prohibitions which my institution extends to students)
Which email address you'll keep longer: students email is temporary, but gmail.com may also be (it may not be hard to imagine that, in some near future, you become infuriated by Google's (or any company's) behavior and close your account). On that note: if you graduated from some institution, you may get a permanent alumni email redirection, which may last longer than all those individual accounts.
Which email looks more professional: smurf19@gmail.com sure doesn't do any good for your reputation.