this is quite funny... all the guys and girls thinking its the other half..
So.. as someone who, dispite any of your problems with how I am, has lived socially as both a guy and a girl.. and dated as both a traditional male, and female, I would say this:
Which one is harder? hmm, its hard.. they both have very distinct differences..
Both have some things that you cannot change:
guys
Height, penis size, facial shape/structure, etc.
Girls
Chest, body-shape (yeah, its not as easy as skinny/fat) facial shape/structure etc.
Both have things that you can change and work on:
guys
Weight, muscles, looking good, wearing the 'right' clothes etc.
girls
weight, makeup, style, hair, clothes..
I would say a lot of the differences in terms of dificulties can lie in the expectations of either sex..
guys work out, and make themselves look better for girls, and for themselves.. but rarely ever, for other guys (friends)
Girls put effort in, for themselves, for boys/partners, but also for other girls, and their friends..
So in that regard, there is an extra layer of pressure..
- another aspect to consider is the media..
Whilst it is true that there is a growing increase in importance of how guys look, its no where near the level of scrutiny women are put under.. everything from the daily-mails collums of shame, to all manner of articles, and female celebrities loosing thier jobs, due to age and apperance, just piles on the pressure..
It is getting better, but its still novel to think of a fat female celebrity.. its a fairly recent thing.. and still considered empowering for women to have these role-models.. whereas for guys in the media, there is a much much larger vairance in body-shape, size, age, looks, etc.
In terms of effort to look better, both have it hard.. but in different ways:
Guys, in general, would tend to require more effort and commitment to gaining this desired muscle.. requiring many hours of hard work and such..
Whereas for girls, less effort may be required in terms of toning/working out to look good.. for them to dress in a way which society as a whole, deems 'good' requires more effort.. hair, makeup, clothes, aperance, grooming, shaving, hair removal, etc.. all takes far far longer then for guys..
So whereas a guy may need to go to the gym, and work harder for longer... he can then spend relitivly little time before going out, and look good.. - for girls it can be the oposite, less time in the gym, but more time on the other aspects of 'looking good'
- in terms of self perception, girls have it a lot worse..
Statistics dont lie on this. more girls have body issues, and more girls harm and kill themselves each year due to body issues, and body-size related bullying. - whether the causes come from guys, girls, the media, themseleves, etc.. its not really up for debate that girls can be much more harsh on themselves, then guys can... (including the old steryotype of the guy who is ugly, but looks in the mirror and goes 'not bad.. looking fine today')
Overal.. I would say:
Both require equal effort to look good, but the effort is spent on different parts of the process.
Girls still get given a harder time by the media, about their looks (though it is becoming more equal by the year)
Both are judged on their looks, but by different groups, and by different criteria.
Girls have a far harder time, personally, with accepting and dealing with how they look (on average)
Both have a number of things that cannot be changed, and a number which can.. but they are sligtly different between the sexes
[*disclaimer - huge huge huge huge generalisations.. but hey, what do you expect when trying to talk about 'girls' and 'guys' as single identities...]