Its a 3 degree glide path that you need to maintain. Where the nose is pointed is dependant on the plane and its wing. The CRJ has no slats, so it has a very nose low approach, if you ever jump seat on one you'd swear that the crew was going to dive straight into the runway. The Saab does have a very nose low approach attitude also. The wing of the plane dictates its angle. At slower speed the angle of attack that is necessary to stay in the air and maintain Vref varies widely from aircraf t to aircraft. In jets that are designed for high speed flight, they need flaps and most needs slats. They need this make up for the slower airflow over the wing and teh less lift that they generate. If you look at jets with slats you'll notice that they have a much higher nose angle on appraoch, comapred to early DC-9s, Fokkers, and the CRJs.
The nose low approach does give you better visibility and helps you judge the flare altitude a lot better though. So, it does have a few advantages.
Hope this helps