Granted, you might not want to pick up ADS-B, but the relative performance of these inexpensive devices is still interesting. The tests used Raspberry PI 3s and a consistent antenna and preamp system.
SwadeWhite has put together a really cool ADS-B plane tracker with a built-in weather station and home automation features.
He’s published a video showing off a portable ADS-B receiver which could be used ... The receiver isn’t particularly special, being a Raspberry Pi with LCD screen and an RTL-SDR receiver ...