actually it depends a lot on preference. the basic plus about an air fork would be the adjustibility. you dont have to buy springs to adjust it to your weight. also, you are not restricted by set spring rates. the feel of an air fork would be a little different from a coil version, but with all the adjustability available nowadays, i am pretty sure you could set up an air fork to any feel that you want.
i would not concentrate so much on an air fork being marginally lighter than a coil version, nor on what people mention about different 'feels', but more on how much would you like to have adjustability. some people prefer the option of being able to adjust stuff to their riding styles, terrains, weight etc. some people find it a headache. figure out which one you are and decide. an air fork would be more adjustable, a coil would not, atleast not on the fly.
i will say that air forks are more likely to have 'issues' like losing travel or getting stuck down etc, but i would not lose much sleep over that, shock technology has come a long way and problems like that are not very regular. you can pretty much count on stuff being more or less reliable..eh, for whatever that is worth.