I have a French door with 2 active panels that swing out. The hinges are security hinges and look just like a normal hinge. First, the pin is captured meaning you can't knock it out. Second, even if you cut the barrel off there is a pin in the hinge that penetrates both hinges when the door is closed that keeps the door from being opened. A package of 3 security hinges shows as $20 on a google search and you can use a set of security hinge pins for $12 also on a google search. And they look like normal hinges until you open the door and look at them. All my outside doors are inset from the weather so they do not get direct exposure. The biggest risk I see is the latch, so be sure to use a deadbolt as well.
The out-swing do seal differently than in-swing, but the out-swing have a better seal IMO. The threshold also helps direct water to the outside better with an outswing. I've not seen a significant price difference between the in-swing and out-swing when I was looking at doors. The out-swing don't acomodate a screen door very well.