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Subway you need a bit of gear and common sense to do so you may not want to do it with your friends without planning if they are dipshits. Subway is cooler than Narrows. Narrows is great too, hardly anyone makes it past the first 1/4 mile or so because it's really tiring going upstream. You can also get a permit to shuttle Narrows from the top and do the whole thing downstream, ending in the park. Both permits are going to be tough to get.
Observation Point is less crowded than Angels Landing. I don't think you would be missing out by doing either one over another, they are both cool. You have to do Emerald Pools no matter what even though it's super crowded just because it's so beautiful and unique. This pic is the Narrows. Sometimes the canyons will be closed for flood warning so if you are going to do one make sure to go for it any good day you get, because you can do the other hikes any day.