Comparing Selectors

I have an issue with comparing selectors. Trouble is, the GNU Objective-C
runtime tells me that SEL's are pointers to struct objc_selector and that they
themselves may not be unique, and the correct way to compare them is by doing:

sel1->sel_id == sel2->sel_id

However, Apple forums and according to what I read about the Apple Objective-C
runtime, doing just

sel1 == sel2

is perfectly fine and that the uniqueness of both selectors is ensured.

So please, can anybody tell me what is the correct, civilized and portable way
of doing it?

Regards
 Saso