As has been said, neither of those 2 seats are amongst the top ones we would recommend.
When you are looking for a seat, of course you are looking for one that installs well in your vehicle, but in terms of use, you also want a tall shell andhigh rearfacing limit, so you can keep your child rearfacing as long as possible, as that is the single most important thing you can do for safety. Those seats have 35 lb rfing limits, and shorter shells, so they wont last nearly as long as many other seats, including seats that are substantially cheaper.
If i only wanted a 35 lb rfing seat, i'd get a truefit. Out of the seats you listed, I'd get a symphony 65. The blvd shell is just SO short, and the top slots are really low. If I were actually purchasing a convertible, I'd get a radian, complete air, myride or alpha omega 50-lb version.