I decided on OT because of many reasons. It seemed (in my VERY limited experience, so this could be completely untrue) as though OTs were more laid back than PTs... like you said, PTs seem to be more athletic, and almost more intense (again, only speaking from limited experience).
I love the different activities that OTs get to do. When I shadowed OTs they got to be really creative -- patients played with play-dough, on swings, worked with eating utensils (though working with the mouth is more the area of a speech pathologist - but OTs work with adaptive tools, so my OT was teaching someone how to use a specially designed fork). The only place I shadowed where the OTs didn't seem to get to be really creative was in the ICU, otherwise it amazingly creative, from clinics to the nursing home! OT is almost an art, really.
I also shadowed a PT at a nursing home (my OT wanted me to see the differences) and it wasn't nearly as fun. If you walked into the PT room you saw all kinds of large equipment, lots of benches, some balls, some practice stairs, etc., but once you walked into the OT room you saw puzzles and crafts, besides equipment.
So, I guess what I'm trying to say is, I feel like OT has more freedom to use creativity.
OT and PT tend to overlap -- but a patient often goes to BOTH.
An OT helps a person regain independence in daily activities. So if a person has been injured and can't dress himself, it's the OT that comes in and helps the person re-learn how to do it. The PT focuses more on the injury itself and regaining function.
And just in case you don't know, as a junior you can start entry-level MOT programs (and PT programs), instead of waiting to graduate. There aren't many -- I actually only know of 2. I'm also a junior and I'm entering an entry-level program in June that will get me my Masters of Occupational Therapy in 3 years. Something to look into 🙂