Most important is the sound of the amplifier once integrated into your system. Pick the one that sounds better. Second, I prefer mono blocks because I believe they have the potential to sound better but more important you can use shorter speaker cables that can be expensive, so the savings there can be put toward the greater cost of the mono blocks.
Stereo or monoblocks
I recently bought a pair of the JBL HDI-3800 speakers. I also own a McIntosh C-2300 preamp. Should I buy a used McIntosh mc402 stereo power amp or try to find a pair of a different brands monoblocks? The new Schiit Tyr has my interest.