None seem to be entirely perfect. I agree that FD (now my.flightradar24.com) doesn't seem that responsive or that they're making much changes. My wish list for them would be to add:
1. Plane Name field
2. Special Livery field
3. Upgrade indicator
4. Some additional reporting capabilities
I did reach out to them with suggestions... but I think their main priority is the main FR24 web/app.
For now... I just keep FlightMemory & FlightDiary up to date. Best of both worlds - detailed reporting from FM, nice UI of FD... and also as data backup protection in case one or the other vanishes overnight.
I've looked at logmyflight, which at least the developer seems active & engaged here on these forums. But the UI is too busy, tracking too many things IMO.
I did check out openflights.org - it seems to be somewhere between FM & FD. The data reporting isn't as powerful as FM though.