IMO:
PH-BN = victory for now, but not next term feasible
PH-BN-Borneo=strong victory with higher chances of winning next term
PN-BN=waste of time and people's money, predict another GE in 3 years time
PN-BN-Borneo=no hope for PH for the next 2 terms, GE again in 3 years

Pains me to say but a PH+BN is a better combo then a whole PN government.