The old one is a nice filter, and works well, but the reason I am switching it out is because it's a bit too much flow for my angelfish and pleco. It's an Aquaclear 70 on a 29 gallon, so even on the lowest setting, the fish prefer the opposite side of the tank.
The only reason I have this filter is because I used to have a goldfish in that 29 gallon and, well, you know how that goes...😉
5G - 1 betta: orange dalmatian VT male "Ty"
29G - 1 orange fantail goldfish "Goldeen"