drinking some hard alchocol and thinking, what is the best choice to achieve best result

with same dual chain antenna!
MIMO 2x2 with 1 card in n or ac

or MIMO 1x1 with 2 separated cards in different frequencies?
last one shall give better throughput..

Is there someone using this setup? please share opinion/results

At the present moment it works best 2x2 N + Nster 40Mhz. With clean channels.
http://kazuko.pl/?p=testyRB911G5HPacDNBplusmANT30

AC is unable to operate stably.