I live in Green Valley, Sydney, so most of the roads i frequently trespass are paved roads that run along the t-way (i'm a bit scared of cycling on the actual road with cars though). My reason for choosing the cyclocross was because i was drawn to the versatility just in case i opted for a more uneven track (and some people mention switching the tires for different roads?). But after considering your comments I think it would be better to buy a road bike for my usual requirements and use the mountain bike for more difficult roads right??

Also, i am turning 18 (the bike is for my birthday so I'm leaning towards a new bike), 165cm tall, just under 60kgs, female. I know very little about bike maintenance although I plan to learn as I go. Living in Australia and all, the weather here can be a little unpredictable but generally it's quite fine and warm. The roads around my home are also quite flat for the most part but can get a little hilly in certain areas. Umm is that all?

And thank you so much for your thoughtful replies i will definitely check out the link and research further. You guys are awesome