Hi all, what are your views on the following:

Nexus 5 vs the two others that have dual SIM, Samsung S5 Dual SIM or the Samsung Note 3 Dual SIM?  Also what is your thought on the ASUS Zenfone? 

I have one SIM for my personal use and I have a second SIM for employment agencies, banks etc .. I am finding myself missing the odd call but I don't get much, still I miss calls.  I carry 2 phones and have to charge 2 phones at work via the computer's USB.  It can also be nice overseas when I have a NZ SIM and pick up a SIM overseas.  I am not fussed whether the second SIM is on standby mode or that it works on 2G.  As the second SIM is only for calls and text.