the shutter noise is much lower, at 16000, but not worth it moreover, except maybe because of the speed of shooting. if you, like me, are actively involved in photography and have a third mark or choose between 3 and 4, I recommend waiting for the release of the fifth. the additional megapixels are not particularly important (there are only 8 more of them).
Revamped Sony Alpha a6000 Mirrorless Digital Camera: 24.3MP SLR Camera with 3.0-Inch LCD and Power Zoom Lens
103 Review
Nikon D3100 DSLR Camera with Auto Focus-S Nikkor Zoom Lens (Discontinued by Manufacturer)
109 Review
Canon EOS 60D: 18MP CMOS Digital SLR Camera Body - Your Next Photography Companion
125 Review
Nikon COOLPIX L810 Digital Camera: 16.1MP, 26x Zoom, NIKKOR ED Glass Lens, 3-inch LCD (Blue)
95 Review