Well as a previous blackbird owner, i cant say bardo is a better performer. Indid not listened them n same conditions, so be picky about my words, i used kuzma stogi ref 313 and 4point with a lots of cartridge. If you want to use multiple arms, blackbird is your only way, as far as i know you may use only one tonearm at bardo and sota. Also at this level, all of this tt are great, picking one of them will not make a big difference, and none of them are make you sad.
Tonearm choices are very important. I was very satified with my kuzma choices with blackbird. I did no like reed on bardo, brinkmann tonearms are better performer on brinkmann tt, also sme goes well with sota.