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Recirculating/external. External skimmers can be placed in a sump. They have the most contact time and control than the other versions of the same model skimmer.
For that volume I'd save another 200$ and buy a Double Cone 200 RD3.
But I'm a sucker for Bubble King.
I haven't used any external skimmers. Why are they better? Will leaking be a problem? There are not many to choose from.
There is no more risk of leaks than an other skimmer especially if you keep it in sump, then there is zero chance of leaks out side onto the floor.
BRS has a great video and in it the explain why they are better. It comes down to the volume in the skimmer body for water/air mixing, contact time of the water with bubbles, and control. Since the skimmer is fed with a separate pump or off a manifold controlling the water level is much easier and it will remain stable no matter the water level in the section of your sump. You will have finer adjustment of the water going into the skimmer. Also since the skimmer recirculates the water it has more contact time with the bubbles. Usually most all external/recirculating skimmers have more volume inside the body of the skimmer for mixing the water and bubbles. That's the main points.
Check out the video:

