I call bs on this. Hunter is not an easy class and whoever tells you it is, has probably never played it, gets owned by it a lot, or thinks there's only BM hunter in game. It is certainly harder than stealthing at 1% hp and speeding away until you heal up.
In 1v1 it will always depend on an individual skill. If a hunter manages to keep his range and get out of cc fast enough, he will win. If a rogue manages to get the hunter in a cc chain, he will win. Both classes CAN win.
In bg I'd pick a hunter, simply cause rogues take a lot of dmg and their role is a bit more "limited". They can look for somebody to sneak up on, defend bases, carry flags but they can't deal constant dmg like hunters can. And they tend to be targeted more often than hunters so whatever you can do as a rogue, do it before you get noticed. I might be wrong here but it's just my experience, you are a bit more engaged in bgs as a hunter.
In arena, both are great, both have their purpose, both have their viable comps. There's really no better or worse in arena, it depends on your skill and your partner.
Hunter has many possibilities and learning when to do what, and how to do it quickly, is what makes it hard. You have to keep million things in mind- keeping range,lowering heals,dmg,cc,pet,traps... As a rogue, you need to learn how to get others in cc chain and how to burst them down quickly, which isn't easy.
To sum up, every class needs a certain time to be learned. Don't choose what is easier, choose what you want to play, what you like more, what you can see yourself having fun with. You can pick the worst class in the game and still be the best at it if you love it and put effort into learning it.