Opera vs. Firefox

i normally use firefox:) but i use opera too especially when i have connection poblems and therefore i m on dial up as it's really able to maintain its fastness even on a slow server! also it has almost all those features which firefox has.but there's one disadvantage of opera that it starts to get stuck when one is using it for some hours(say 3 or 4) constantly.it starts working too slow then.whereas there's no such prolem in firefox.

I will present an interesting and funny fact here. My fiance uses Firefox, and I use Opera. And, both of us are always debating that the browsers we are using are better. he always says in for of Firefox, and I always say in for of Opera. But there are certain instances when he had to admit that Opera is better than Firefox. It is faster, has a good system of tabloid surfing, and is really user friendly, with a beautifull interface.