These establishments are classified differently by our Boston, USA based 'friends' at TA.
Nigi Nigi Too is ranked 5th of 54 Boracay speciality lodgings, while The Strand is ranked 10th of 122 hotels in Boracay.
Both are high rankings, meaning that a majority of guests have been satisfied or very satisfied with their stay.
If price is not a consideration, I suggest that you choose by looking at room and overall property pictures and thinking which of these you find more attractive. There might be a particular feature of a holiday property that you particularly enjoy: if one has it and the other doesn't, choose the former.
Unless you are very picky or most unfortunate, you are fairly likely to have an enjoyable stay at either going on the reviews. All you have to hope for now is that God doesn't send the rain crashing down 24 hours a day while you are there!
If all else fails, show your children pictures of the two places and get them to choose!
Edited: 05 August 2012, 0:06