From my expierence, THe corner tanks are very cool, it does depend on what type of fish you want. Because its a tall tank, if you want alot of activity, you have to find fish that swim up and down alot. Some fish like the room to swim across a tank. It also limits you on the size of fish you want. My tank is 44
gal, but have a pretty small foot print, so a very large fish wouldnt work. If I was to get a 55
gal long, it would open the doors to a much larger fish. that 11 gallons is not much, but making so much more swimming area.
My 44
gal is also hard to clean. I have to practically climb in the tank to do my vaccuums.
Also, look at how your home is set up. If you have small rooms that have alot of open corners, the corner tank would work fine. But if you have larger rooms, sometimes a long tank can be more impressive. It gives the room a focal point.
Im my home we have alot of windows, and large doorways and a very open floor plan. I am very limited on where I could put my corner tank. but a long tank would have worked much better in my home. It would just take up alot of space. Think about what kind of fish you like, then go from there.
HTH