Many of then barely used ... but always searching for the definitive SBC:
Raspberry Pi B everything stars here.
Raspberry Pi B+ : Solving many issues from the previous version.
Raspberry Pi A+ : Really low power consumption, this will be a good starting point to something with dual core balancing power & consumption.
Raspberry Pi 2B the Good
Raspberry Pi 3B the Ugly
Raspberry Pi Zero : Main Kodi OSMC board, really, I don't need more.
Raspberry Pi Zero W : Used as a CCTV.
Raspberry Pi 3B+ the Bad
ODROID-U3 : The best SBC I have with eMMC and 2GB. But today without updates from hardkernel.
ODROID-C1 : Many problems before C1+ arrive ... good board but not better than U3.
UG802 RK3066 : Reconverted Android TV with Picuntu, used on a weekly basis sharing more than 1000 small torrents and waiting for a death that never arrives.
Banana Pi PRO : main home NAS with last armbian and OMV, Plex and Torrents. SATA & Gigabit marks the difference.
Orange Pi One : When I know this board has armbian support I decided to buy only because is cheap and not hopping so much ... but is a really good board for the price.
Orange Pi Lite : After having OPi One I want to try this with Wi-Fi and more USB. Used with Lakka as Retrogame platform.
Orange Pi PC : Looking for a substitute or back-up of my Banana Pi PRO or the Lakka. Good CPU performance but never used a lot.
Orange Pi PC2 : Again looking for a second NAS board. Good performance and net bandwidth. With SSD and UASP can be a good and cheap board to be used as NAS or light server.
Beelink X2 : after the success, in my opinion, I'm always searching for good Android TV box to be converted in a cheap Linux PC. This was a good one, difficult to have the Wi-Fi up and running in the beginning. This board shows me also the TV box root problem: same name but different hardware (Wi-Fi, NAND, eMMC, RAM, ...).
MXQ PRO+ 4k : received to test it. Appreciate the @balbes150 effort but many boards with different hardware and I never have the Wi-Fi on my unit working (with many hours spent on this).
DragonBoard 410c : I wined on a raffled!!! Really good board. With the last Linaro Debian Buster it feels like a light PC but without a proper case, I can use normally.
NanoPi Neo2 : Another try to have a small NAS. Good board overall but the position of cables is not the better to be used as a server. Please, FriendlyCore thinks on having power, network and 1 x USB in one side.
Sunvell R69 : I like small boards and small TV boxes. The case of Android TV boxes is one of my main reasons to love this piece of cr*p. A pity this one is more or less good but the Wi-Fi is a real sh*t only capable of keeping SSH connexions.
La Frite: last addition to the crew. Only booted once. I'm thinking in use as my new Kodi center when the OS or LibreElec will be released.
C.H.I.P. the $9 computer: I bought with a lot of hopes in my time and projects. I like the Chrome use to flash the board but when the company disappears I know this is the wrong approach. Good ideas in this board: the female GPIO with pinout printed, the built-in battery control, ...
Omega2 : is another kind of devices I only used sometimes to be a Wi-Fi Gateway. I think is a really good device for IoT projects.