The main advantage of true bi-amplification is reduction of distortion caused by internal passive crossovers at high volume playback volumes.
A good stereo amp is just as good as two mono blocks, mono blocks make sense only if very high volume playback levels are needed, I would personally avoid then to reduce clutter and keep things a bit simple.
Another advantage of bi amplification is much reduced power requirement from each amp compared to conventional systems, this again is another good reason for choosing stereo amp instead of monoblocks.
I have JBL 4350 speakers, these are designed strictly for bi-amplification, the hi and low ends are internally not connected and must be bi-amplified. I use two 200 watts stereo amps with active crossover, the low end is 96 dB and the high end is 99 dB. My music room is very large 18' x 27' with high sloping ceiling, the loudest sound level that I can tolerate requires 30 watts per channel max, I see absolutely no reason or justification for monoblocks with this setup, high quality stereo apps are more than adequate.