There are two "pro" arguments for using CE circuit:
1) Manufacturer recommended use CE due to the transistor pin configuration. This is actually not very strong argument.
2) CC that I designed seems to be very unstable, it could works fine on a determined frequency, but there appear a lot of "parasitic" 2pi phase shifts on arbitrary frequencies while frequency tuning. This is not strong argument too, but having a stable CE circuit, I want to use it and have a good output power (more than 0 dBm).
Although output power value is not very important, it is something like an educational project. I just think, that -10 dBm is very low value. Or it is not?