thats cool, you have an unpopular opinion. DLC for FO3 is also much better, but lets conveniently leave that out.because fallout 3 is plagued with monotonous gameplay, shytty dialogue, and a third act that's something of a joke.
new vegas plays like the old fallout games more than fallout 3. it's less linear, better written, and has MUCH more enjoyable combat. if you've played fallout 1 and 2, you're better off skipping fallout 3 and playing new vegas instead.
There is no comparison...let you old faithful fallout heads enjoy the step down that NV was compared to 3. Just because something remains faithful to the franchise doesn't necessarily mean its better...and in this case FO3 was the better experience. Critics and fans agree.