I haven't sorted through all of my photos yet so my judgement might be somewhat premature, but I had the D3200 for about 5 months before the trip and the images coming out of that camera are some of the finest that I have ever produced. From what I can see so far from the shots that I took on the trip, I like the looks from the D3200 images a little more than the ones with the D5100, but I shot about 2/3 with the D3200. I would take these comments with a grain of salt since the D5100 is definitely a fine camera. I did like the additional controls on the D5100.
DXO Mark rates the sensor in the D3200 as the second best DX sensor made, to date, and one of the 10 best in the world so that may have subconsciously influenced my otherwise "objective," or maybe it's "subjective," opinion. They both cost the same amount of money with the kit lens, and if I had it to do over, I would buy the D3200 again. The D600 and D3200 would have made better sense for me since I had almost all FX lenses. The $900 that I wouldn't have had to pay for the 10-24 would have brought the effective cost of the D600 down to $1,200.00. I bought it at Berger Bros and Brad bought it back from me after the trip for $725.00. They're nice people to do business with. Needless to say I bought the D600 from him too. Sorry, I had to add that "plug." jP