The Flightaware stand alone filter is an LC filter.
The Pro Stick + (Blue) has an integral SAW filter.

A Cavity filter will sure give precise and narrow band width, but cost $100 to $150(6 to 10 times the cost of LC or SAW filter).

In my case, Flightaware's $15.50 LC filter did the job well.
In few very severe noisy location, a costly cavity filter may needed. On ebay 1090 Mhz SAW filter are available for around $20, and may be good, but I did not try these.