I wanted to hear everyones thoughts/opinions/experience with the differences between a "Brick & Mortar" business vs. an "E-Business"

So this is what I'd like to know...

1) Which one have you found to be the quickest to start up. (including franchises)
2) Which is the most rewarding
3) Is there a difference between the products/services that are available for each business model? (is there a particular service/product that seems to be easier to sell/promote in either the B&M or E-Bus?)
4) Which one have you been able to produce sells quicker with?
5) Do you think its best to have a combination of both?