Because Barrhaven is in the middle of Ottawa, it takes about 20 minutes to go to downtown, Kanata, south keys. It is quite accessible without the highway, via Greenbank, Prince of Whales, Woodroofe, Cederview. Some people are worried about airplane noise, but for most parts of the town it is not bad. Beside, once you are inside the house, the noise becomes very small because your lawnmowers, bus traffic are even louder than airplane.
Riverside south is going to be a great location in a few years. When the bridge opens, people can shop at Barrhaven. Transit is starting to improve. This location is probably the only one free of any health hazards: it's not close to power lines, radon gas, landfill, and there's no airplane noise. Development in Riverside South is very slow: it already took the city a couple of years to widen Riverside Rd, and there is still only one grocery store.
Also use this chance to talk about other communities:
Kanata lakes and morgans grants are built on rocky lands, so they have the danger to get Radon gas. Stittsville is too far and has flooding problem. The only advantage of Kanata is good high school.
Orleans is a fast-developing community, it is the biggest of all communities. But similar to Kanata, it depends too much on the highway to get to downtown. Houses are cheap at Orleans. There are no problems with this area. There are quite many university students/professors living in this area, since it's close to U of O.
Just my 2 cents. We currently live in Barrhaven, and just bought again in Barrhaven.