Line 6 spider 15watt vs 6watt micro?

OK so im looking to buy my first amp and im looking for a starter one that has good effects and can make some noise. I was looking at the line 6 amps(since all my friends have it and its pretty good to me, so please dont reccommend the peavey vypyr 15, that just looks bad) and I was looking at the 15w model first when i saw the micro amp, and since im moving constanly i was wondering which one was right for me. I also want to bring it to school to play there and pretty much the room is around 11 meters by 5 meters (for those in the US its about 36 feet by 16 feet) so I also want an amp that can fill the whole room with noise. any help would be greatly appreciated