Here we are comparing two cameras with different body types: Pentax WG-3 GPS, which was introduced in July 2013 is a Waterproof camera with a 16.0MP 1/2.3" sensor whereas Olympus E-M10, which was introduced in March 2014 is a Entry-Level Mirrorless camera with a 16.0MP Four Thirds sensor.
Comparing an interchangeble lens camera to a fixed lens camera is a bit tricky but we will do our best to make this a fair comparison. Fortunately, you can't go wrong with any of these cameras as we rank them amongst Top 10 cameras in their classes. Pentax WG-3 GPS is ranked #7
out of 73 Waterproof cameras with an overall score of 54 whereas Olympus E-M10 is ranked #4
out of 100 Entry-Level Mirrorless cameras with an overall score of 76.
Let's have a brief look at the main features of Pentax WG-3 GPS and Olympus E-M10 before getting into our more detailed comparison.